diff --git a/3rdparty/singleapplication/CMakeLists.txt b/3rdparty/singleapplication/CMakeLists.txt
index 033f0a61a..2febf5aa6 100644
--- a/3rdparty/singleapplication/CMakeLists.txt
+++ b/3rdparty/singleapplication/CMakeLists.txt
@@ -6,31 +6,7 @@ include(CheckFunctionExists)
 check_function_exists(geteuid HAVE_GETEUID)
 check_function_exists(getpwuid HAVE_GETPWUID)
 
-set(SINGLEAPP-SOURCES singleapplication.cpp singleapplication_p.cpp)
-set(SINGLEAPP-MOC-HEADERS singleapplication.h singleapplication_p.h)
-qt_wrap_cpp(SINGLEAPP-SOURCES-MOC ${SINGLEAPP-MOC-HEADERS})
-add_library(singleapplication STATIC ${SINGLEAPP-SOURCES} ${SINGLEAPP-SOURCES-MOC})
-target_include_directories(singleapplication PRIVATE
-  ${CMAKE_CURRENT_SOURCE_DIR}
-  ${CMAKE_CURRENT_BINARY_DIR}
-)
-target_link_libraries(singleapplication PRIVATE
-  ${QtCore_LIBRARIES}
-  ${QtWidgets_LIBRARIES}
-  ${QtNetwork_LIBRARIES}
-)
-
-set(SINGLECOREAPP-SOURCES singlecoreapplication.cpp singlecoreapplication_p.cpp)
-set(SINGLECOREAPP-MOC-HEADERS singlecoreapplication.h singlecoreapplication_p.h)
-qt_wrap_cpp(SINGLECOREAPP-SOURCES-MOC ${SINGLECOREAPP-MOC-HEADERS})
-add_library(singlecoreapplication STATIC ${SINGLECOREAPP-SOURCES} ${SINGLECOREAPP-SOURCES-MOC})
-target_include_directories(singlecoreapplication PRIVATE
-  ${CMAKE_CURRENT_SOURCE_DIR}
-  ${CMAKE_CURRENT_BINARY_DIR}
-)
-target_link_libraries(singlecoreapplication PRIVATE
-  ${QtCore_LIBRARIES}
-  ${QtNetwork_LIBRARIES}
-)
-
 configure_file(config.h.in "${CMAKE_CURRENT_BINARY_DIR}/config.h")
+
+add_subdirectory(singleapplication)
+add_subdirectory(singlecoreapplication)
diff --git a/3rdparty/singleapplication/singleapplication/CMakeLists.txt b/3rdparty/singleapplication/singleapplication/CMakeLists.txt
new file mode 100644
index 000000000..ac57d2b0f
--- /dev/null
+++ b/3rdparty/singleapplication/singleapplication/CMakeLists.txt
@@ -0,0 +1,17 @@
+cmake_minimum_required(VERSION 3.7)
+
+add_definitions(-DSINGLEAPPLICATION)
+
+set(SOURCES ../singleapplication_t.cpp ../singleapplication_p.cpp)
+set(HEADERS ../singleapplication_t.h ../singleapplication_p.h)
+qt_wrap_cpp(MOC ${HEADERS})
+add_library(singleapplication STATIC ${SOURCES} ${MOC})
+target_include_directories(singleapplication PUBLIC
+  ${CMAKE_CURRENT_SOURCE_DIR}/..
+  ${CMAKE_CURRENT_BINARY_DIR}/..
+)
+target_link_libraries(singleapplication PUBLIC
+  ${QtCore_LIBRARIES}
+  ${QtWidgets_LIBRARIES}
+  ${QtNetwork_LIBRARIES}
+)
diff --git a/3rdparty/singleapplication/singleapplication/singleapplication.h b/3rdparty/singleapplication/singleapplication/singleapplication.h
new file mode 100644
index 000000000..34beb3ce8
--- /dev/null
+++ b/3rdparty/singleapplication/singleapplication/singleapplication.h
@@ -0,0 +1,13 @@
+#ifndef SINGLEAPPLICATION_H
+#define SINGLEAPPLICATION_H
+
+#ifdef SINGLEAPPLICATION
+#  error "SINGLEAPPLICATION already defined."
+#endif
+
+#define SINGLEAPPLICATION
+#include "../singleapplication_t.h"
+#undef SINGLEAPPLICATION_T_H
+#undef SINGLEAPPLICATION
+
+#endif  // SINGLEAPPLICATION_H
diff --git a/3rdparty/singleapplication/singleapplication_p.cpp b/3rdparty/singleapplication/singleapplication_p.cpp
index 125d09a88..c2df52863 100644
--- a/3rdparty/singleapplication/singleapplication_p.cpp
+++ b/3rdparty/singleapplication/singleapplication_p.cpp
@@ -68,17 +68,17 @@
 #  include <QDateTime>
 #endif
 
-#include "singleapplication.h"
+#include "singleapplication_t.h"
 #include "singleapplication_p.h"
 
-SingleApplicationPrivate::SingleApplicationPrivate(SingleApplication *ptr)
+SingleApplicationPrivateClass::SingleApplicationPrivateClass(SingleApplicationClass *ptr)
     : q_ptr(ptr),
       memory_(nullptr),
       socket_(nullptr),
       server_(nullptr),
       instanceNumber_(-1) {}
 
-SingleApplicationPrivate::~SingleApplicationPrivate() {
+SingleApplicationPrivateClass::~SingleApplicationPrivateClass() {
 
   if (socket_ != nullptr) {
     socket_->close();
@@ -105,7 +105,7 @@ SingleApplicationPrivate::~SingleApplicationPrivate() {
 
 }
 
-QString SingleApplicationPrivate::getUsername() {
+QString SingleApplicationPrivateClass::getUsername() {
 
 #ifdef Q_OS_UNIX
   QString username;
@@ -141,36 +141,36 @@ QString SingleApplicationPrivate::getUsername() {
 
 }
 
-void SingleApplicationPrivate::genBlockServerName() {
+void SingleApplicationPrivateClass::genBlockServerName() {
 
   QCryptographicHash appData(QCryptographicHash::Sha256);
   appData.addData("SingleApplication");
-  appData.addData(SingleApplication::app_t::applicationName().toUtf8());
-  appData.addData(SingleApplication::app_t::organizationName().toUtf8());
-  appData.addData(SingleApplication::app_t::organizationDomain().toUtf8());
+  appData.addData(SingleApplicationClass::applicationName().toUtf8());
+  appData.addData(SingleApplicationClass::organizationName().toUtf8());
+  appData.addData(SingleApplicationClass::organizationDomain().toUtf8());
 
-  if (!(options_ & SingleApplication::Mode::ExcludeAppVersion)) {
-    appData.addData(SingleApplication::app_t::applicationVersion().toUtf8());
+  if (!(options_ & SingleApplicationClass::Mode::ExcludeAppVersion)) {
+    appData.addData(SingleApplicationClass::applicationVersion().toUtf8());
   }
 
-  if (!(options_ & SingleApplication::Mode::ExcludeAppPath)) {
+  if (!(options_ & SingleApplicationClass::Mode::ExcludeAppPath)) {
 #if defined(Q_OS_UNIX)
     const QByteArray appImagePath = qgetenv("APPIMAGE");
     if (appImagePath.isEmpty()) {
-      appData.addData(SingleApplication::app_t::applicationFilePath().toUtf8());
+      appData.addData(SingleApplicationClass::applicationFilePath().toUtf8());
     }
     else {
       appData.addData(appImagePath);
     }
 #elif defined(Q_OS_WIN)
-    appData.addData(SingleApplication::app_t::applicationFilePath().toLower().toUtf8());
+    appData.addData(SingleApplicationClass::applicationFilePath().toLower().toUtf8());
 #else
-    appData.addData(SingleApplication::app_t::applicationFilePath().toUtf8());
+    appData.addData(SingleApplicationClass::applicationFilePath().toUtf8());
 #endif
   }
 
   // User level block requires a user specific data in the hash
-  if (options_ & SingleApplication::Mode::User) {
+  if (options_ & SingleApplicationClass::Mode::User) {
     appData.addData(getUsername().toUtf8());
   }
 
@@ -179,7 +179,7 @@ void SingleApplicationPrivate::genBlockServerName() {
 
 }
 
-void SingleApplicationPrivate::initializeMemoryBlock() const {
+void SingleApplicationPrivateClass::initializeMemoryBlock() const {
 
   InstancesInfo *instance = static_cast<InstancesInfo*>(memory_->data());
   instance->primary = false;
@@ -190,7 +190,7 @@ void SingleApplicationPrivate::initializeMemoryBlock() const {
 
 }
 
-void SingleApplicationPrivate::startPrimary() {
+void SingleApplicationPrivateClass::startPrimary() {
 
   // Reset the number of connections
   InstancesInfo *instance = static_cast<InstancesInfo*>(memory_->data());
@@ -206,7 +206,7 @@ void SingleApplicationPrivate::startPrimary() {
   server_ = new QLocalServer();
 
   // Restrict access to the socket according to the SingleApplication::Mode::User flag on User level or no restrictions
-  if (options_ & SingleApplication::Mode::User) {
+  if (options_ & SingleApplicationClass::Mode::User) {
     server_->setSocketOptions(QLocalServer::UserAccessOption);
   }
   else {
@@ -214,11 +214,11 @@ void SingleApplicationPrivate::startPrimary() {
   }
 
   server_->listen(blockServerName_);
-  QObject::connect(server_, &QLocalServer::newConnection, this, &SingleApplicationPrivate::slotConnectionEstablished);
+  QObject::connect(server_, &QLocalServer::newConnection, this, &SingleApplicationPrivateClass::slotConnectionEstablished);
 
 }
 
-void SingleApplicationPrivate::startSecondary() {
+void SingleApplicationPrivateClass::startSecondary() {
 
   InstancesInfo *instance = static_cast<InstancesInfo*>(memory_->data());
 
@@ -228,7 +228,7 @@ void SingleApplicationPrivate::startSecondary() {
 
 }
 
-bool SingleApplicationPrivate::connectToPrimary(const int timeout, const ConnectionType connectionType) {
+bool SingleApplicationPrivateClass::connectToPrimary(const int timeout, const ConnectionType connectionType) {
 
   QElapsedTimer time;
   time.start();
@@ -282,11 +282,11 @@ bool SingleApplicationPrivate::connectToPrimary(const int timeout, const Connect
 
 }
 
-void SingleApplicationPrivate::writeAck(QLocalSocket *sock) {
+void SingleApplicationPrivateClass::writeAck(QLocalSocket *sock) {
   sock->putChar('\n');
 }
 
-bool SingleApplicationPrivate::writeConfirmedMessage(const int timeout, const QByteArray &msg) const {
+bool SingleApplicationPrivateClass::writeConfirmedMessage(const int timeout, const QByteArray &msg) const {
 
   QElapsedTimer time;
   time.start();
@@ -306,7 +306,7 @@ bool SingleApplicationPrivate::writeConfirmedMessage(const int timeout, const QB
 
 }
 
-bool SingleApplicationPrivate::writeConfirmedFrame(const int timeout, const QByteArray &msg) const {
+bool SingleApplicationPrivateClass::writeConfirmedFrame(const int timeout, const QByteArray &msg) const {
 
   socket_->write(msg);
   socket_->flush();
@@ -321,7 +321,7 @@ bool SingleApplicationPrivate::writeConfirmedFrame(const int timeout, const QByt
 
 }
 
-quint16 SingleApplicationPrivate::blockChecksum() const {
+quint16 SingleApplicationPrivateClass::blockChecksum() const {
 
 #if QT_VERSION >= QT_VERSION_CHECK(6, 0, 0)
   quint16 checksum = qChecksum(QByteArray(static_cast<const char*>(memory_->constData()), offsetof(InstancesInfo, checksum)));
@@ -333,7 +333,7 @@ quint16 SingleApplicationPrivate::blockChecksum() const {
 
 }
 
-qint64 SingleApplicationPrivate::primaryPid() const {
+qint64 SingleApplicationPrivateClass::primaryPid() const {
 
   memory_->lock();
   InstancesInfo *instance = static_cast<InstancesInfo*>(memory_->data());
@@ -344,7 +344,7 @@ qint64 SingleApplicationPrivate::primaryPid() const {
 
 }
 
-QString SingleApplicationPrivate::primaryUser() const {
+QString SingleApplicationPrivateClass::primaryUser() const {
 
   memory_->lock();
   InstancesInfo *instance = static_cast<InstancesInfo*>(memory_->data());
@@ -358,7 +358,7 @@ QString SingleApplicationPrivate::primaryUser() const {
 /**
  * @brief Executed when a connection has been made to the LocalServer
  */
-void SingleApplicationPrivate::slotConnectionEstablished() {
+void SingleApplicationPrivateClass::slotConnectionEstablished() {
 
   QLocalSocket *nextConnSocket = server_->nextPendingConnection();
   connectionMap_.insert(nextConnSocket, ConnectionInfo());
@@ -396,7 +396,7 @@ void SingleApplicationPrivate::slotConnectionEstablished() {
 
 }
 
-void SingleApplicationPrivate::readMessageHeader(QLocalSocket *sock, const SingleApplicationPrivate::ConnectionStage nextStage) {
+void SingleApplicationPrivateClass::readMessageHeader(QLocalSocket *sock, const SingleApplicationPrivateClass::ConnectionStage nextStage) {
 
   if (!connectionMap_.contains(sock)) {
     return;
@@ -420,7 +420,7 @@ void SingleApplicationPrivate::readMessageHeader(QLocalSocket *sock, const Singl
 
 }
 
-bool SingleApplicationPrivate::isFrameComplete(QLocalSocket *sock) {
+bool SingleApplicationPrivateClass::isFrameComplete(QLocalSocket *sock) {
 
   if (!connectionMap_.contains(sock)) {
     return false;
@@ -431,9 +431,9 @@ bool SingleApplicationPrivate::isFrameComplete(QLocalSocket *sock) {
 
 }
 
-void SingleApplicationPrivate::readInitMessageBody(QLocalSocket *sock) {
+void SingleApplicationPrivateClass::readInitMessageBody(QLocalSocket *sock) {
 
-  Q_Q(SingleApplication);
+  Q_Q(SingleApplicationClass);
 
   if (!isFrameComplete(sock)) {
     return;
@@ -478,7 +478,7 @@ void SingleApplicationPrivate::readInitMessageBody(QLocalSocket *sock) {
   info.instanceId = instanceId;
   info.stage = StageConnectedHeader;
 
-  if (connectionType == NewInstance || (connectionType == SecondaryInstance && options_ & SingleApplication::Mode::SecondaryNotification)) {
+  if (connectionType == NewInstance || (connectionType == SecondaryInstance && options_ & SingleApplicationClass::Mode::SecondaryNotification)) {
     emit q->instanceStarted();
   }
 
@@ -486,9 +486,9 @@ void SingleApplicationPrivate::readInitMessageBody(QLocalSocket *sock) {
 
 }
 
-void SingleApplicationPrivate::slotDataAvailable(QLocalSocket *dataSocket, const quint32 instanceId) {
+void SingleApplicationPrivateClass::slotDataAvailable(QLocalSocket *dataSocket, const quint32 instanceId) {
 
-  Q_Q(SingleApplication);
+  Q_Q(SingleApplicationClass);
 
   if (!isFrameComplete(dataSocket)) {
     return;
@@ -505,7 +505,7 @@ void SingleApplicationPrivate::slotDataAvailable(QLocalSocket *dataSocket, const
 
 }
 
-void SingleApplicationPrivate::slotClientConnectionClosed(QLocalSocket *closedSocket, const quint32 instanceId) {
+void SingleApplicationPrivateClass::slotClientConnectionClosed(QLocalSocket *closedSocket, const quint32 instanceId) {
 
   if (closedSocket->bytesAvailable() > 0) {
     slotDataAvailable(closedSocket, instanceId);
@@ -513,7 +513,7 @@ void SingleApplicationPrivate::slotClientConnectionClosed(QLocalSocket *closedSo
 
 }
 
-void SingleApplicationPrivate::randomSleep() {
+void SingleApplicationPrivateClass::randomSleep() {
 
 #if QT_VERSION >= QT_VERSION_CHECK(5, 10, 0)
   QThread::msleep(QRandomGenerator::global()->bounded(8U, 18U));
diff --git a/3rdparty/singleapplication/singleapplication_p.h b/3rdparty/singleapplication/singleapplication_p.h
index 26f334aee..26f2e39a1 100644
--- a/3rdparty/singleapplication/singleapplication_p.h
+++ b/3rdparty/singleapplication/singleapplication_p.h
@@ -39,7 +39,7 @@
 #include <QString>
 #include <QHash>
 
-#include "singleapplication.h"
+#include "singleapplication_t.h"
 
 class QLocalServer;
 class QLocalSocket;
@@ -60,7 +60,7 @@ struct ConnectionInfo {
   quint8 stage;
 };
 
-class SingleApplicationPrivate : public QObject {
+class SingleApplicationPrivateClass : public QObject {
   Q_OBJECT
 
  public:
@@ -76,10 +76,10 @@ class SingleApplicationPrivate : public QObject {
     StageConnectedHeader = 2,
     StageConnectedBody = 3,
   };
-  Q_DECLARE_PUBLIC(SingleApplication)
+  Q_DECLARE_PUBLIC(SingleApplicationClass)
 
-  explicit SingleApplicationPrivate(SingleApplication *ptr);
-  ~SingleApplicationPrivate() override;
+  explicit SingleApplicationPrivateClass(SingleApplicationClass *ptr);
+  ~SingleApplicationPrivateClass() override;
 
   static QString getUsername();
   void genBlockServerName();
@@ -98,13 +98,13 @@ class SingleApplicationPrivate : public QObject {
   bool writeConfirmedMessage(const int timeout, const QByteArray &msg) const;
   static void randomSleep();
 
-  SingleApplication *q_ptr;
+  SingleApplicationClass *q_ptr;
   QSharedMemory *memory_;
   QLocalSocket *socket_;
   QLocalServer *server_;
   quint32 instanceNumber_;
   QString blockServerName_;
-  SingleApplication::Options options_;
+  SingleApplicationClass::Options options_;
   QHash<QLocalSocket*, ConnectionInfo> connectionMap_;
 
  public slots:
diff --git a/3rdparty/singleapplication/singleapplication.cpp b/3rdparty/singleapplication/singleapplication_t.cpp
similarity index 78%
rename from 3rdparty/singleapplication/singleapplication.cpp
rename to 3rdparty/singleapplication/singleapplication_t.cpp
index 650944f97..724b6da37 100644
--- a/3rdparty/singleapplication/singleapplication.cpp
+++ b/3rdparty/singleapplication/singleapplication_t.cpp
@@ -35,7 +35,6 @@
 #include <limits>
 
 #include <QtGlobal>
-#include <QApplication>
 #include <QThread>
 #include <QSharedMemory>
 #include <QLocalSocket>
@@ -46,7 +45,7 @@
 #  include <QNativeIpcKey>
 #endif
 
-#include "singleapplication.h"
+#include "singleapplication_t.h"
 #include "singleapplication_p.h"
 
 /**
@@ -57,11 +56,15 @@
  * @param options Optional flags to toggle specific behaviour
  * @param timeout Maximum time blocking functions are allowed during app load
  */
-SingleApplication::SingleApplication(int &argc, char *argv[], const bool allowSecondary, const Options options, const int timeout)
-    : app_t(argc, argv),
-      d_ptr(new SingleApplicationPrivate(this)) {
+SingleApplicationClass::SingleApplicationClass(int &argc, char *argv[], const bool allowSecondary, const Options options, const int timeout)
+    : ApplicationClass(argc, argv),
+      d_ptr(new SingleApplicationPrivateClass(this)) {
 
+#if defined(SINGLEAPPLICATION)
   Q_D(SingleApplication);
+#elif defined(SINGLECOREAPPLICATION)
+  Q_D(SingleCoreApplication);
+#endif
 
   // Store the current mode of the program
   d->options_ = options;
@@ -70,7 +73,7 @@ SingleApplication::SingleApplication(int &argc, char *argv[], const bool allowSe
   d->genBlockServerName();
 
   // To mitigate QSharedMemory issues with large amount of processes attempting to attach at the same time
-  SingleApplicationPrivate::randomSleep();
+  SingleApplicationPrivateClass::randomSleep();
 
 #ifdef Q_OS_UNIX
   // By explicitly attaching it and then deleting it we make sure that the memory is deleted even after the process has crashed on Unix.
@@ -138,7 +141,7 @@ SingleApplication::SingleApplication(int &argc, char *argv[], const bool allowSe
       qDebug() << "SingleApplication: Unable to unlock memory for random wait.";
       qDebug() << d->memory_->errorString();
     }
-    SingleApplicationPrivate::randomSleep();
+    SingleApplicationPrivateClass::randomSleep();
     if (!d->memory_->lock()) {
       qCritical() << "SingleApplication: Unable to lock memory after random wait.";
       abortSafely();
@@ -158,7 +161,7 @@ SingleApplication::SingleApplication(int &argc, char *argv[], const bool allowSe
   if (allowSecondary) {
     d->startSecondary();
     if (d->options_ & Mode::SecondaryNotification) {
-      d->connectToPrimary(timeout, SingleApplicationPrivate::SecondaryInstance);
+      d->connectToPrimary(timeout, SingleApplicationPrivateClass::SecondaryInstance);
     }
     if (!d->memory_->unlock()) {
       qDebug() << "SingleApplication: Unable to unlock memory after secondary start.";
@@ -172,33 +175,54 @@ SingleApplication::SingleApplication(int &argc, char *argv[], const bool allowSe
     qDebug() << d->memory_->errorString();
   }
 
-  d->connectToPrimary(timeout, SingleApplicationPrivate::NewInstance);
+  d->connectToPrimary(timeout, SingleApplicationPrivateClass::NewInstance);
 
   delete d;
 
 }
 
-SingleApplication::~SingleApplication() {
+SingleApplicationClass::~SingleApplicationClass() {
+
+#if defined(SINGLEAPPLICATION)
   Q_D(SingleApplication);
+#elif defined(SINGLECOREAPPLICATION)
+  Q_D(SingleCoreApplication);
+#endif
+
   delete d;
+
 }
 
 /**
  * Checks if the current application instance is primary.
  * @return Returns true if the instance is primary, false otherwise.
  */
-bool SingleApplication::isPrimary() const {
+bool SingleApplicationClass::isPrimary() const {
+
+#if defined(SINGLEAPPLICATION)
   Q_D(const SingleApplication);
+#elif defined(SINGLECOREAPPLICATION)
+  Q_D(const SingleCoreApplication);
+#endif
+
   return d->server_ != nullptr;
+
 }
 
 /**
  * Checks if the current application instance is secondary.
  * @return Returns true if the instance is secondary, false otherwise.
  */
-bool SingleApplication::isSecondary() const {
+bool SingleApplicationClass::isSecondary() const {
+
+#if defined(SINGLEAPPLICATION)
   Q_D(const SingleApplication);
+#elif defined(SINGLECOREAPPLICATION)
+  Q_D(const SingleCoreApplication);
+#endif
+
   return d->server_ == nullptr;
+
 }
 
 /**
@@ -206,9 +230,16 @@ bool SingleApplication::isSecondary() const {
  * It is reset when the first (primary) instance of your app starts and only incremented afterwards.
  * @return Returns a unique instance id.
  */
-quint32 SingleApplication::instanceId() const {
+quint32 SingleApplicationClass::instanceId() const {
+
+#if defined(SINGLEAPPLICATION)
   Q_D(const SingleApplication);
+#elif defined(SINGLECOREAPPLICATION)
+  Q_D(const SingleCoreApplication);
+#endif
+
   return d->instanceNumber_;
+
 }
 
 /**
@@ -216,26 +247,40 @@ quint32 SingleApplication::instanceId() const {
  * Especially useful when SingleApplication is coupled with OS. specific APIs.
  * @return Returns the primary instance PID.
  */
-qint64 SingleApplication::primaryPid() const {
+qint64 SingleApplicationClass::primaryPid() const {
+
+#if defined(SINGLEAPPLICATION)
   Q_D(const SingleApplication);
+#elif defined(SINGLECOREAPPLICATION)
+  Q_D(const SingleCoreApplication);
+#endif
+
   return d->primaryPid();
+
 }
 
 /**
  * Returns the username the primary instance is running as.
  * @return Returns the username the primary instance is running as.
  */
-QString SingleApplication::primaryUser() const {
+QString SingleApplicationClass::primaryUser() const {
+
+#if defined(SINGLEAPPLICATION)
   Q_D(const SingleApplication);
+#elif defined(SINGLECOREAPPLICATION)
+  Q_D(const SingleCoreApplication);
+#endif
+
   return d->primaryUser();
+
 }
 
 /**
  * Returns the username the current instance is running as.
  * @return Returns the username the current instance is running as.
  */
-QString SingleApplication::currentUser() const {
-  return SingleApplicationPrivate::getUsername();
+QString SingleApplicationClass::currentUser() const {
+  return SingleApplicationPrivateClass::getUsername();
 }
 
 /**
@@ -244,28 +289,37 @@ QString SingleApplication::currentUser() const {
  * @param timeout the maximum timeout in milliseconds for blocking functions.
  * @return true if the message was sent successfully, false otherwise.
  */
-bool SingleApplication::sendMessage(const QByteArray &message, const int timeout) {
+bool SingleApplicationClass::sendMessage(const QByteArray &message, const int timeout) {
 
+#if defined(SINGLEAPPLICATION)
   Q_D(SingleApplication);
+#elif defined(SINGLECOREAPPLICATION)
+  Q_D(SingleCoreApplication);
+#endif
 
   // Nobody to connect to
   if (isPrimary()) return false;
 
   // Make sure the socket is connected
-  if (!d->connectToPrimary(timeout, SingleApplicationPrivate::Reconnect)) {
+  if (!d->connectToPrimary(timeout, SingleApplicationPrivateClass::Reconnect)) {
     return false;
   }
 
   return d->writeConfirmedMessage(timeout, message);
+
 }
 
 /**
  * Cleans up the shared memory block and exits with a failure.
  * This function halts program execution.
  */
-void SingleApplication::abortSafely() {
+void SingleApplicationClass::abortSafely() {
 
+#if defined(SINGLEAPPLICATION)
   Q_D(SingleApplication);
+#elif defined(SINGLECOREAPPLICATION)
+  Q_D(SingleCoreApplication);
+#endif
 
   qCritical() << "SingleApplication: " << d->memory_->error() << d->memory_->errorString();
   delete d;
diff --git a/3rdparty/singleapplication/singleapplication.h b/3rdparty/singleapplication/singleapplication_t.h
similarity index 77%
rename from 3rdparty/singleapplication/singleapplication.h
rename to 3rdparty/singleapplication/singleapplication_t.h
index 2e92da140..3e1cb24ba 100644
--- a/3rdparty/singleapplication/singleapplication.h
+++ b/3rdparty/singleapplication/singleapplication_t.h
@@ -31,25 +31,41 @@
 //
 //
 
-#ifndef SINGLEAPPLICATION_H
-#define SINGLEAPPLICATION_H
+#ifndef SINGLEAPPLICATION_T_H
+#define SINGLEAPPLICATION_T_H
 
 #include <QtGlobal>
-#include <QApplication>
+
+#undef ApplicationClass
+#undef SingleApplicationClass
+#undef SingleApplicationPrivateClass
+
+#if defined(SINGLEAPPLICATION)
+#  include <QApplication>
+#  define ApplicationClass QApplication
+#  define SingleApplicationClass SingleApplication
+#  define SingleApplicationPrivateClass SingleApplicationPrivate
+#elif defined(SINGLECOREAPPLICATION)
+#  include <QCoreApplication>
+#  define ApplicationClass QCoreApplication
+#  define SingleApplicationClass SingleCoreApplication
+#  define SingleApplicationPrivateClass SingleCoreApplicationPrivate
+#else
+#  error "Define SINGLEAPPLICATION or SINGLECOREAPPLICATION."
+#endif
+
 #include <QFlags>
 #include <QByteArray>
 
-class SingleApplicationPrivate;
+class SingleApplicationPrivateClass;
 
 /**
  * @brief The SingleApplication class handles multiple instances of the same Application
  * @see QApplication
  */
-class SingleApplication : public QApplication {  // clazy:exclude=ctor-missing-parent-argument
+class SingleApplicationClass : public ApplicationClass {  // clazy:exclude=ctor-missing-parent-argument
   Q_OBJECT
 
-  using app_t = QApplication;
-
  public:
   /**
    * @brief Mode of operation of SingleApplication.
@@ -89,8 +105,8 @@ class SingleApplication : public QApplication {  // clazy:exclude=ctor-missing-p
    * initialisation will be completed in given time, though is a good hint.
    * Usually 4*timeout would be the worst case (fail) scenario.
    */
-  explicit SingleApplication(int &argc, char *argv[], const bool allowSecondary = false, const Options options = Mode::User, const int timeout = 1000);
-  ~SingleApplication() override;
+  explicit SingleApplicationClass(int &argc, char *argv[], const bool allowSecondary = false, const Options options = Mode::User, const int timeout = 1000);
+  ~SingleApplicationClass() override;
 
   /**
    * @brief Returns if the instance is the primary instance
@@ -142,11 +158,15 @@ class SingleApplication : public QApplication {  // clazy:exclude=ctor-missing-p
   void receivedMessage(quint32 instanceId, QByteArray message);
 
  private:
-  SingleApplicationPrivate *d_ptr;
+  SingleApplicationPrivateClass *d_ptr;
+#if defined(SINGLEAPPLICATION)
   Q_DECLARE_PRIVATE(SingleApplication)
+#elif defined(SINGLECOREAPPLICATION)
+  Q_DECLARE_PRIVATE(SingleCoreApplication)
+#endif
   void abortSafely();
 };
 
-Q_DECLARE_OPERATORS_FOR_FLAGS(SingleApplication::Options)
+Q_DECLARE_OPERATORS_FOR_FLAGS(SingleApplicationClass::Options)
 
-#endif  // SINGLEAPPLICATION_H
+#endif  // SINGLEAPPLICATION_T_H
diff --git a/3rdparty/singleapplication/singlecoreapplication.cpp b/3rdparty/singleapplication/singlecoreapplication.cpp
deleted file mode 100644
index 1b960ea7a..000000000
--- a/3rdparty/singleapplication/singlecoreapplication.cpp
+++ /dev/null
@@ -1,275 +0,0 @@
-// The MIT License (MIT)
-//
-// Copyright (c) Itay Grudev 2015 - 2020
-//
-// Permission is hereby granted, free of charge, to any person obtaining a copy
-// of this software and associated documentation files (the "Software"), to deal
-// in the Software without restriction, including without limitation the rights
-// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
-// copies of the Software, and to permit persons to whom the Software is
-// furnished to do so, subject to the following conditions:
-//
-// The above copyright notice and this permission notice shall be included in
-// all copies or substantial portions of the Software.
-//
-// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
-// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
-// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
-// THE SOFTWARE.
-
-//
-//  W A R N I N G !!!
-//  -----------------
-//
-// This is a modified version of SingleApplication,
-// The original version is at:
-//
-// https://github.com/itay-grudev/SingleApplication
-//
-//
-
-#include <cstdlib>
-#include <limits>
-
-#include <QtGlobal>
-#include <QCoreApplication>
-#include <QThread>
-#include <QSharedMemory>
-#include <QLocalSocket>
-#include <QByteArray>
-#include <QElapsedTimer>
-#include <QtDebug>
-#if QT_VERSION >= QT_VERSION_CHECK(6, 6, 0)
-#  include <QNativeIpcKey>
-#endif
-
-#include "singlecoreapplication.h"
-#include "singlecoreapplication_p.h"
-
-/**
- * @brief Constructor. Checks and fires up LocalServer or closes the program if another instance already exists
- * @param argc
- * @param argv
- * @param allowSecondary Whether to enable secondary instance support
- * @param options Optional flags to toggle specific behaviour
- * @param timeout Maximum time blocking functions are allowed during app load
- */
-SingleCoreApplication::SingleCoreApplication(int &argc, char *argv[], const bool allowSecondary, const Options options, const int timeout)
-    : app_t(argc, argv),
-      d_ptr(new SingleCoreApplicationPrivate(this)) {
-
-  Q_D(SingleCoreApplication);
-
-  // Store the current mode of the program
-  d->options_ = options;
-
-  // Generating an application ID used for identifying the shared memory block and QLocalServer
-  d->genBlockServerName();
-
-  // To mitigate QSharedMemory issues with large amount of processes attempting to attach at the same time
-  SingleCoreApplicationPrivate::randomSleep();
-
-#ifdef Q_OS_UNIX
-  // By explicitly attaching it and then deleting it we make sure that the memory is deleted even after the process has crashed on Unix.
-#if QT_VERSION >= QT_VERSION_CHECK(6, 6, 0)
-  d->memory_ = new QSharedMemory(QNativeIpcKey(d->blockServerName_));
-#else
-  d->memory_ = new QSharedMemory(d->blockServerName_);
-#endif
-  d->memory_->attach();
-  delete d->memory_;
-#endif
-
-  // Guarantee thread safe behaviour with a shared memory block.
-#if QT_VERSION >= QT_VERSION_CHECK(6, 6, 0)
-  d->memory_ = new QSharedMemory(QNativeIpcKey(d->blockServerName_));
-#else
-  d->memory_ = new QSharedMemory(d->blockServerName_);
-#endif
-
-  // Create a shared memory block
-  if (d->memory_->create(sizeof(InstancesInfo))) {
-    // Initialize the shared memory block
-    if (!d->memory_->lock()) {
-      qCritical() << "SingleCoreApplication: Unable to lock memory block after create.";
-      abortSafely();
-    }
-    d->initializeMemoryBlock();
-  }
-  else {
-    if (d->memory_->error() == QSharedMemory::AlreadyExists) {
-      // Attempt to attach to the memory segment
-      if (!d->memory_->attach()) {
-        qCritical() << "SingleCoreApplication: Unable to attach to shared memory block.";
-        abortSafely();
-      }
-      if (!d->memory_->lock()) {
-        qCritical() << "SingleCoreApplication: Unable to lock memory block after attach.";
-        abortSafely();
-      }
-    }
-    else {
-      qCritical() << "SingleCoreApplication: Unable to create block.";
-      abortSafely();
-    }
-  }
-
-  InstancesInfo *instance = static_cast<InstancesInfo*>(d->memory_->data());
-  QElapsedTimer time;
-  time.start();
-
-  // Make sure the shared memory block is initialised and in consistent state
-  forever {
-    // If the shared memory block's checksum is valid continue
-    if (d->blockChecksum() == instance->checksum) break;
-
-    // If more than 5s have elapsed, assume the primary instance crashed and assume it's position
-    if (time.elapsed() > 5000) {
-      qWarning() << "SingleCoreApplication: Shared memory block has been in an inconsistent state from more than 5s. Assuming primary instance failure.";
-      d->initializeMemoryBlock();
-    }
-
-    // Otherwise wait for a random period and try again.
-    // The random sleep here limits the probability of a collision between two racing apps and allows the app to initialise faster
-    if (!d->memory_->unlock()) {
-      qDebug() << "SingleCoreApplication: Unable to unlock memory for random wait.";
-      qDebug() << d->memory_->errorString();
-    }
-    SingleCoreApplicationPrivate::randomSleep();
-    if (!d->memory_->lock()) {
-      qCritical() << "SingleCoreApplication: Unable to lock memory after random wait.";
-      abortSafely();
-    }
-  }
-
-  if (!instance->primary) {
-    d->startPrimary();
-    if (!d->memory_->unlock()) {
-      qDebug() << "SingleCoreApplication: Unable to unlock memory after primary start.";
-      qDebug() << d->memory_->errorString();
-    }
-    return;
-  }
-
-  // Check if another instance can be started
-  if (allowSecondary) {
-    d->startSecondary();
-    if (d->options_ & Mode::SecondaryNotification) {
-      d->connectToPrimary(timeout, SingleCoreApplicationPrivate::SecondaryInstance);
-    }
-    if (!d->memory_->unlock()) {
-      qDebug() << "SingleCoreApplication: Unable to unlock memory after secondary start.";
-      qDebug() << d->memory_->errorString();
-    }
-    return;
-  }
-
-  if (!d->memory_->unlock()) {
-    qDebug() << "SingleCoreApplication: Unable to unlock memory at end of execution.";
-    qDebug() << d->memory_->errorString();
-  }
-
-  d->connectToPrimary(timeout, SingleCoreApplicationPrivate::NewInstance);
-
-  delete d;
-
-}
-
-SingleCoreApplication::~SingleCoreApplication() {
-  Q_D(SingleCoreApplication);
-  delete d;
-}
-
-/**
- * Checks if the current application instance is primary.
- * @return Returns true if the instance is primary, false otherwise.
- */
-bool SingleCoreApplication::isPrimary() const {
-  Q_D(const SingleCoreApplication);
-  return d->server_ != nullptr;
-}
-
-/**
- * Checks if the current application instance is secondary.
- * @return Returns true if the instance is secondary, false otherwise.
- */
-bool SingleCoreApplication::isSecondary() const {
-  Q_D(const SingleCoreApplication);
-  return d->server_ == nullptr;
-}
-
-/**
- * Allows you to identify an instance by returning unique consecutive instance ids.
- * It is reset when the first (primary) instance of your app starts and only incremented afterwards.
- * @return Returns a unique instance id.
- */
-quint32 SingleCoreApplication::instanceId() const {
-  Q_D(const SingleCoreApplication);
-  return d->instanceNumber_;
-}
-
-/**
- * Returns the OS PID (Process Identifier) of the process running the primary instance.
- * Especially useful when SingleCoreApplication is coupled with OS. specific APIs.
- * @return Returns the primary instance PID.
- */
-qint64 SingleCoreApplication::primaryPid() const {
-  Q_D(const SingleCoreApplication);
-  return d->primaryPid();
-}
-
-/**
- * Returns the username the primary instance is running as.
- * @return Returns the username the primary instance is running as.
- */
-QString SingleCoreApplication::primaryUser() const {
-  Q_D(const SingleCoreApplication);
-  return d->primaryUser();
-}
-
-/**
- * Returns the username the current instance is running as.
- * @return Returns the username the current instance is running as.
- */
-QString SingleCoreApplication::currentUser() const {
-  return SingleCoreApplicationPrivate::getUsername();
-}
-
-/**
- * Sends message to the Primary Instance.
- * @param message The message to send.
- * @param timeout the maximum timeout in milliseconds for blocking functions.
- * @return true if the message was sent successfully, false otherwise.
- */
-bool SingleCoreApplication::sendMessage(const QByteArray &message, const int timeout) {
-
-  Q_D(SingleCoreApplication);
-
-  // Nobody to connect to
-  if (isPrimary()) return false;
-
-  // Make sure the socket is connected
-  if (!d->connectToPrimary(timeout, SingleCoreApplicationPrivate::Reconnect)) {
-    return false;
-  }
-
-  return d->writeConfirmedMessage(timeout, message);
-}
-
-/**
- * Cleans up the shared memory block and exits with a failure.
- * This function halts program execution.
- */
-void SingleCoreApplication::abortSafely() {
-
-  Q_D(SingleCoreApplication);
-
-  qCritical() << "SingleCoreApplication: " << d->memory_->error() << d->memory_->errorString();
-  delete d;
-
-  ::exit(EXIT_FAILURE);
-
-}
diff --git a/3rdparty/singleapplication/singlecoreapplication.h b/3rdparty/singleapplication/singlecoreapplication.h
deleted file mode 100644
index 97759f1c4..000000000
--- a/3rdparty/singleapplication/singlecoreapplication.h
+++ /dev/null
@@ -1,152 +0,0 @@
-// The MIT License (MIT)
-//
-// Copyright (c) Itay Grudev 2015 - 2020
-//
-// Permission is hereby granted, free of charge, to any person obtaining a copy
-// of this software and associated documentation files (the "Software"), to deal
-// in the Software without restriction, including without limitation the rights
-// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
-// copies of the Software, and to permit persons to whom the Software is
-// furnished to do so, subject to the following conditions:
-//
-// The above copyright notice and this permission notice shall be included in
-// all copies or substantial portions of the Software.
-//
-// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
-// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
-// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
-// THE SOFTWARE.
-
-//
-//  W A R N I N G !!!
-//  -----------------
-//
-// This is a modified version of SingleApplication,
-// The original version is at:
-//
-// https://github.com/itay-grudev/SingleApplication
-//
-//
-
-#ifndef SINGLECOREAPPLICATION_H
-#define SINGLECOREAPPLICATION_H
-
-#include <QtGlobal>
-#include <QCoreApplication>
-#include <QFlags>
-#include <QByteArray>
-
-class SingleCoreApplicationPrivate;
-
-/**
- * @brief The SingleCoreApplication class handles multiple instances of the same Application
- * @see QCoreApplication
- */
-class SingleCoreApplication : public QCoreApplication {  // clazy:exclude=ctor-missing-parent-argument
-  Q_OBJECT
-
-  using app_t = QCoreApplication;
-
- public:
-  /**
-   * @brief Mode of operation of SingleCoreApplication.
-   * Whether the block should be user-wide or system-wide and whether the
-   * primary instance should be notified when a secondary instance had been
-   * started.
-   * @note Operating system can restrict the shared memory blocks to the same
-   * user, in which case the User/System modes will have no effect and the
-   * block will be user wide.
-   * @enum
-   */
-  enum class Mode {
-    User = 1 << 0,
-    System = 1 << 1,
-    SecondaryNotification = 1 << 2,
-    ExcludeAppVersion = 1 << 3,
-    ExcludeAppPath = 1 << 4
-  };
-  Q_DECLARE_FLAGS(Options, Mode)
-
-  /**
-   * @brief Intitializes a SingleCoreApplication instance with argc command line
-   * arguments in argv
-   * @arg {int &} argc - Number of arguments in argv
-   * @arg {const char *[]} argv - Supplied command line arguments
-   * @arg {bool} allowSecondary - Whether to start the instance as secondary
-   * if there is already a primary instance.
-   * @arg {Mode} mode - Whether for the SingleCoreApplication block to be applied
-   * User wide or System wide.
-   * @arg {int} timeout - Timeout to wait in milliseconds.
-   * @note argc and argv may be changed as Qt removes arguments that it
-   * recognizes
-   * @note Mode::SecondaryNotification only works if set on both the primary
-   * instance and the secondary instance.
-   * @note The timeout is just a hint for the maximum time of blocking
-   * operations. It does not guarantee that the SingleCoreApplication
-   * initialisation will be completed in given time, though is a good hint.
-   * Usually 4*timeout would be the worst case (fail) scenario.
-   */
-  explicit SingleCoreApplication(int &argc, char *argv[], const bool allowSecondary = false, const Options options = Mode::User, const int timeout = 1000);
-  ~SingleCoreApplication() override;
-
-  /**
-   * @brief Returns if the instance is the primary instance
-   * @returns {bool}
-   */
-  bool isPrimary() const;
-
-  /**
-   * @brief Returns if the instance is a secondary instance
-   * @returns {bool}
-   */
-  bool isSecondary() const;
-
-  /**
-   * @brief Returns a unique identifier for the current instance
-   * @returns {qint32}
-   */
-  quint32 instanceId() const;
-
-  /**
-   * @brief Returns the process ID (PID) of the primary instance
-   * @returns {qint64}
-   */
-  qint64 primaryPid() const;
-
-  /**
-   * @brief Returns the username of the user running the primary instance
-   * @returns {QString}
-   */
-  QString primaryUser() const;
-
-  /**
-   * @brief Returns the username of the current user
-   * @returns {QString}
-   */
-  QString currentUser() const;
-
-  /**
-   * @brief Sends a message to the primary instance. Returns true on success.
-   * @param {int} timeout - Timeout for connecting
-   * @returns {bool}
-   * @note sendMessage() will return false if invoked from the primary
-   * instance.
-   */
-  bool sendMessage(const QByteArray &message, const int timeout = 1000);
-
- signals:
-  void instanceStarted();
-  void receivedMessage(quint32 instanceId, QByteArray message);
-
- private:
-  SingleCoreApplicationPrivate *d_ptr;
-  Q_DECLARE_PRIVATE(SingleCoreApplication)
-  void abortSafely();
-};
-
-Q_DECLARE_OPERATORS_FOR_FLAGS(SingleCoreApplication::Options)
-
-#endif  // SINGLECOREAPPLICATION_H
diff --git a/3rdparty/singleapplication/singlecoreapplication/CMakeLists.txt b/3rdparty/singleapplication/singlecoreapplication/CMakeLists.txt
new file mode 100644
index 000000000..919c896cb
--- /dev/null
+++ b/3rdparty/singleapplication/singlecoreapplication/CMakeLists.txt
@@ -0,0 +1,16 @@
+cmake_minimum_required(VERSION 3.7)
+
+add_definitions(-DSINGLECOREAPPLICATION)
+
+set(SOURCES ../singleapplication_t.cpp ../singleapplication_p.cpp)
+set(HEADERS ../singleapplication_t.h ../singleapplication_p.h)
+qt_wrap_cpp(MOC ${HEADERS})
+add_library(singlecoreapplication STATIC ${SOURCES} ${MOC})
+target_include_directories(singlecoreapplication PUBLIC
+  ${CMAKE_CURRENT_SOURCE_DIR}/..
+  ${CMAKE_CURRENT_BINARY_DIR}/..
+)
+target_link_libraries(singlecoreapplication PUBLIC
+  ${QtCore_LIBRARIES}
+  ${QtNetwork_LIBRARIES}
+)
diff --git a/3rdparty/singleapplication/singlecoreapplication/singlecoreapplication.h b/3rdparty/singleapplication/singlecoreapplication/singlecoreapplication.h
new file mode 100644
index 000000000..0d510c61f
--- /dev/null
+++ b/3rdparty/singleapplication/singlecoreapplication/singlecoreapplication.h
@@ -0,0 +1,13 @@
+#ifndef SINGLECOREAPPLICATION_H
+#define SINGLECOREAPPLICATION_H
+
+#ifdef SINGLECOREAPPLICATION
+#  error "SINGLECOREAPPLICATION already defined."
+#endif
+
+#define SINGLECOREAPPLICATION
+#include "../singleapplication_t.h"
+#undef SINGLEAPPLICATION_T_H
+#undef SINGLECOREAPPLICATION
+
+#endif  // SINGLECOREAPPLICATION_H
diff --git a/3rdparty/singleapplication/singlecoreapplication_p.cpp b/3rdparty/singleapplication/singlecoreapplication_p.cpp
deleted file mode 100644
index 2fd87bcec..000000000
--- a/3rdparty/singleapplication/singlecoreapplication_p.cpp
+++ /dev/null
@@ -1,525 +0,0 @@
-// The MIT License (MIT)
-//
-// Copyright (c) Itay Grudev 2015 - 2020
-//
-// Permission is hereby granted, free of charge, to any person obtaining a copy
-// of this software and associated documentation files (the "Software"), to deal
-// in the Software without restriction, including without limitation the rights
-// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
-// copies of the Software, and to permit persons to whom the Software is
-// furnished to do so, subject to the following conditions:
-//
-// The above copyright notice and this permission notice shall be included in
-// all copies or substantial portions of the Software.
-//
-// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
-// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
-// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
-// THE SOFTWARE.
-
-//
-//  W A R N I N G !!!
-//  -----------------
-//
-// This is a modified version of SingleApplication,
-// The original version is at:
-//
-// https://github.com/itay-grudev/SingleApplication
-//
-//
-
-#include "config.h"
-
-#include <QtGlobal>
-
-#include <cstdlib>
-#include <cstddef>
-
-#ifdef Q_OS_UNIX
-#  include <unistd.h>
-#  include <sys/types.h>
-#  include <pwd.h>
-#endif
-
-#ifdef Q_OS_WIN
-#  ifndef NOMINMAX
-#    define NOMINMAX 1
-#  endif
-#  include <windows.h>
-#  include <lmcons.h>
-#endif
-
-#include <QObject>
-#include <QThread>
-#include <QIODevice>
-#include <QSharedMemory>
-#include <QByteArray>
-#include <QDataStream>
-#include <QCryptographicHash>
-#include <QLocalServer>
-#include <QLocalSocket>
-#include <QElapsedTimer>
-#if QT_VERSION >= QT_VERSION_CHECK(5, 10, 0)
-#  include <QRandomGenerator>
-#else
-#  include <QDateTime>
-#endif
-
-#include "singlecoreapplication.h"
-#include "singlecoreapplication_p.h"
-
-SingleCoreApplicationPrivate::SingleCoreApplicationPrivate(SingleCoreApplication *ptr)
-    : q_ptr(ptr),
-      memory_(nullptr),
-      socket_(nullptr),
-      server_(nullptr),
-      instanceNumber_(-1) {}
-
-SingleCoreApplicationPrivate::~SingleCoreApplicationPrivate() {
-
-  if (socket_ != nullptr) {
-    socket_->close();
-    delete socket_;
-    socket_ = nullptr;
-  }
-
-  if (memory_ != nullptr) {
-    memory_->lock();
-    InstancesInfo *instance = static_cast<InstancesInfo*>(memory_->data());
-    if (server_ != nullptr) {
-      server_->close();
-      delete server_;
-      instance->primary = false;
-      instance->primaryPid = -1;
-      instance->primaryUser[0] = '\0';
-      instance->checksum = blockChecksum();
-    }
-    memory_->unlock();
-
-    delete memory_;
-    memory_ = nullptr;
-  }
-
-}
-
-QString SingleCoreApplicationPrivate::getUsername() {
-
-#ifdef Q_OS_UNIX
-  QString username;
-#if defined(HAVE_GETEUID) && defined(HAVE_GETPWUID)
-  struct passwd *pw = getpwuid(geteuid());
-  if (pw) {
-    username = QString::fromLocal8Bit(pw->pw_name);
-  }
-#endif
-  if (username.isEmpty()) {
-#if QT_VERSION >= QT_VERSION_CHECK(5, 10, 0)
-    username = qEnvironmentVariable("USER");
-#else
-    username = QString::fromLocal8Bit(qgetenv("USER"));
-#endif
-  }
-  return username;
-#endif
-
-#ifdef Q_OS_WIN
-  wchar_t username[UNLEN + 1];
-  // Specifies size of the buffer on input
-  DWORD usernameLength = UNLEN + 1;
-  if (GetUserNameW(username, &usernameLength)) {
-    return QString::fromWCharArray(username);
-  }
-#if QT_VERSION >= QT_VERSION_CHECK(5, 10, 0)
-  return qEnvironmentVariable("USERNAME");
-#else
-  return QString::fromLocal8Bit(qgetenv("USERNAME"));
-#endif
-#endif
-
-}
-
-void SingleCoreApplicationPrivate::genBlockServerName() {
-
-  QCryptographicHash appData(QCryptographicHash::Sha256);
-  appData.addData("SingleApplication");
-  appData.addData(SingleCoreApplication::app_t::applicationName().toUtf8());
-  appData.addData(SingleCoreApplication::app_t::organizationName().toUtf8());
-  appData.addData(SingleCoreApplication::app_t::organizationDomain().toUtf8());
-
-  if (!(options_ & SingleCoreApplication::Mode::ExcludeAppVersion)) {
-    appData.addData(SingleCoreApplication::app_t::applicationVersion().toUtf8());
-  }
-
-  if (!(options_ & SingleCoreApplication::Mode::ExcludeAppPath)) {
-#if defined(Q_OS_UNIX)
-    const QByteArray appImagePath = qgetenv("APPIMAGE");
-    if (appImagePath.isEmpty()) {
-      appData.addData(SingleCoreApplication::app_t::applicationFilePath().toUtf8());
-    }
-    else {
-      appData.addData(appImagePath);
-    }
-#elif defined(Q_OS_WIN)
-    appData.addData(SingleCoreApplication::app_t::applicationFilePath().toLower().toUtf8());
-#else
-    appData.addData(SingleCoreApplication::app_t::applicationFilePath().toUtf8());
-#endif
-  }
-
-  // User level block requires a user specific data in the hash
-  if (options_ & SingleCoreApplication::Mode::User) {
-    appData.addData(getUsername().toUtf8());
-  }
-
-  // Replace the backslash in RFC 2045 Base64 [a-zA-Z0-9+/=] to comply with server naming requirements.
-  blockServerName_ = appData.result().toBase64().replace("/", "_");
-
-}
-
-void SingleCoreApplicationPrivate::initializeMemoryBlock() const {
-
-  InstancesInfo *instance = static_cast<InstancesInfo*>(memory_->data());
-  instance->primary = false;
-  instance->secondary = 0;
-  instance->primaryPid = -1;
-  instance->primaryUser[0] = '\0';
-  instance->checksum = blockChecksum();
-
-}
-
-void SingleCoreApplicationPrivate::startPrimary() {
-
-  // Reset the number of connections
-  InstancesInfo *instance = static_cast<InstancesInfo*>(memory_->data());
-
-  instance->primary = true;
-  instance->primaryPid = QCoreApplication::applicationPid();
-  qstrncpy(instance->primaryUser, getUsername().toUtf8().data(), sizeof(instance->primaryUser));
-  instance->checksum = blockChecksum();
-  instanceNumber_ = 0;
-  // Successful creation means that no main process exists
-  // So we start a QLocalServer to listen for connections
-  QLocalServer::removeServer(blockServerName_);
-  server_ = new QLocalServer();
-
-  // Restrict access to the socket according to the SingleCoreApplication::Mode::User flag on User level or no restrictions
-  if (options_ & SingleCoreApplication::Mode::User) {
-    server_->setSocketOptions(QLocalServer::UserAccessOption);
-  }
-  else {
-    server_->setSocketOptions(QLocalServer::WorldAccessOption);
-  }
-
-  server_->listen(blockServerName_);
-  QObject::connect(server_, &QLocalServer::newConnection, this, &SingleCoreApplicationPrivate::slotConnectionEstablished);
-
-}
-
-void SingleCoreApplicationPrivate::startSecondary() {
-
-  InstancesInfo *instance = static_cast<InstancesInfo*>(memory_->data());
-
-  instance->secondary += 1;
-  instance->checksum = blockChecksum();
-  instanceNumber_ = instance->secondary;
-
-}
-
-bool SingleCoreApplicationPrivate::connectToPrimary(const int timeout, const ConnectionType connectionType) {
-
-  QElapsedTimer time;
-  time.start();
-
-  // Connect to the Local Server of the Primary Instance if not already connected.
-  if (socket_ == nullptr) {
-    socket_ = new QLocalSocket();
-  }
-
-  if (socket_->state() == QLocalSocket::ConnectedState) return true;
-
-  if (socket_->state() != QLocalSocket::ConnectedState) {
-
-    forever {
-      randomSleep();
-
-      if (socket_->state() != QLocalSocket::ConnectingState) {
-        socket_->connectToServer(blockServerName_);
-      }
-
-      if (socket_->state() == QLocalSocket::ConnectingState) {
-        socket_->waitForConnected(static_cast<int>(timeout - time.elapsed()));
-      }
-
-      // If connected break out of the loop
-      if (socket_->state() == QLocalSocket::ConnectedState) break;
-
-      // If elapsed time since start is longer than the method timeout return
-      if (time.elapsed() >= timeout) return false;
-    }
-  }
-
-  // Initialisation message according to the SingleCoreApplication protocol
-  QByteArray initMsg;
-  QDataStream writeStream(&initMsg, QIODevice::WriteOnly);
-  writeStream.setVersion(QDataStream::Qt_5_8);
-
-  writeStream << blockServerName_.toLatin1();
-  writeStream << static_cast<quint8>(connectionType);
-  writeStream << instanceNumber_;
-
-#if QT_VERSION >= QT_VERSION_CHECK(6, 0, 0)
-  quint16 checksum = qChecksum(QByteArray(initMsg, static_cast<quint32>(initMsg.length())));
-#else
-  quint16 checksum = qChecksum(initMsg.constData(), static_cast<quint32>(initMsg.length()));
-#endif
-
-  writeStream << checksum;
-
-  return writeConfirmedMessage(static_cast<int>(timeout - time.elapsed()), initMsg);
-
-}
-
-void SingleCoreApplicationPrivate::writeAck(QLocalSocket *sock) {
-  sock->putChar('\n');
-}
-
-bool SingleCoreApplicationPrivate::writeConfirmedMessage(const int timeout, const QByteArray &msg) const {
-
-  QElapsedTimer time;
-  time.start();
-
-  // Frame 1: The header indicates the message length that follows
-  QByteArray header;
-  QDataStream headerStream(&header, QIODevice::WriteOnly);
-  headerStream.setVersion(QDataStream::Qt_5_8);
-  headerStream << static_cast<quint64>(msg.length());
-
-  if (!writeConfirmedFrame(static_cast<int>(timeout - time.elapsed()), header)) {
-    return false;
-  }
-
-  // Frame 2: The message
-  return writeConfirmedFrame(static_cast<int>(timeout - time.elapsed()), msg);
-
-}
-
-bool SingleCoreApplicationPrivate::writeConfirmedFrame(const int timeout, const QByteArray &msg) const {
-
-  socket_->write(msg);
-  socket_->flush();
-
-  bool result = socket_->waitForReadyRead(timeout);
-  if (result) {
-    socket_->read(1);
-    return true;
-  }
-
-  return false;
-
-}
-
-quint16 SingleCoreApplicationPrivate::blockChecksum() const {
-
-#if QT_VERSION >= QT_VERSION_CHECK(6, 0, 0)
-  quint16 checksum = qChecksum(QByteArray(static_cast<const char*>(memory_->constData()), offsetof(InstancesInfo, checksum)));
-#else
-  quint16 checksum = qChecksum(static_cast<const char*>(memory_->constData()), offsetof(InstancesInfo, checksum));
-#endif
-
-  return checksum;
-
-}
-
-qint64 SingleCoreApplicationPrivate::primaryPid() const {
-
-  memory_->lock();
-  InstancesInfo *instance = static_cast<InstancesInfo*>(memory_->data());
-  qint64 pid = instance->primaryPid;
-  memory_->unlock();
-
-  return pid;
-
-}
-
-QString SingleCoreApplicationPrivate::primaryUser() const {
-
-  memory_->lock();
-  InstancesInfo *instance = static_cast<InstancesInfo*>(memory_->data());
-  QByteArray username = instance->primaryUser;
-  memory_->unlock();
-
-  return QString::fromUtf8(username);
-
-}
-
-/**
- * @brief Executed when a connection has been made to the LocalServer
- */
-void SingleCoreApplicationPrivate::slotConnectionEstablished() {
-
-  QLocalSocket *nextConnSocket = server_->nextPendingConnection();
-  connectionMap_.insert(nextConnSocket, ConnectionInfo());
-
-  QObject::connect(nextConnSocket, &QLocalSocket::aboutToClose, this, [nextConnSocket, this]() {
-    const ConnectionInfo &info = connectionMap_[nextConnSocket];
-    slotClientConnectionClosed(nextConnSocket, info.instanceId);
-  });
-
-  QObject::connect(nextConnSocket, &QLocalSocket::disconnected, nextConnSocket, &QLocalSocket::deleteLater);
-
-  QObject::connect(nextConnSocket, &QLocalSocket::destroyed, this, [nextConnSocket, this]() {
-    connectionMap_.remove(nextConnSocket);
-  });
-
-  QObject::connect(nextConnSocket, &QLocalSocket::readyRead, this, [nextConnSocket, this]() {
-    const ConnectionInfo &info = connectionMap_[nextConnSocket];
-    switch (info.stage) {
-      case StageInitHeader:
-        readMessageHeader(nextConnSocket, StageInitBody);
-        break;
-      case StageInitBody:
-        readInitMessageBody(nextConnSocket);
-        break;
-      case StageConnectedHeader:
-        readMessageHeader(nextConnSocket, StageConnectedBody);
-        break;
-      case StageConnectedBody:
-        this->slotDataAvailable(nextConnSocket, info.instanceId);
-        break;
-      default:
-        break;
-    }
-  });
-
-}
-
-void SingleCoreApplicationPrivate::readMessageHeader(QLocalSocket *sock, SingleCoreApplicationPrivate::ConnectionStage nextStage) {
-
-  if (!connectionMap_.contains(sock)) {
-    return;
-  }
-
-  if (sock->bytesAvailable() < static_cast<qint64>(sizeof(quint64))) {
-    return;
-  }
-
-  QDataStream headerStream(sock);
-  headerStream.setVersion(QDataStream::Qt_5_8);
-
-  // Read the header to know the message length
-  quint64 msgLen = 0;
-  headerStream >> msgLen;
-  ConnectionInfo &info = connectionMap_[sock];
-  info.stage = nextStage;
-  info.msgLen = msgLen;
-
-  writeAck(sock);
-
-}
-
-bool SingleCoreApplicationPrivate::isFrameComplete(QLocalSocket *sock) {
-
-  if (!connectionMap_.contains(sock)) {
-    return false;
-  }
-
-  ConnectionInfo &info = connectionMap_[sock];
-  return (sock->bytesAvailable() >= static_cast<qint64>(info.msgLen));
-
-}
-
-void SingleCoreApplicationPrivate::readInitMessageBody(QLocalSocket *sock) {
-
-  Q_Q(SingleCoreApplication);
-
-  if (!isFrameComplete(sock)) {
-    return;
-  }
-
-  // Read the message body
-  QByteArray msgBytes = sock->readAll();
-  QDataStream readStream(msgBytes);
-  readStream.setVersion(QDataStream::Qt_5_8);
-
-  // server name
-  QByteArray latin1Name;
-  readStream >> latin1Name;
-
-  // connection type
-  quint8 connTypeVal = InvalidConnection;
-  readStream >> connTypeVal;
-  const ConnectionType connectionType = static_cast<ConnectionType>(connTypeVal);
-
-  // instance id
-  quint32 instanceId = 0;
-  readStream >> instanceId;
-
-  // checksum
-  quint16 msgChecksum = 0;
-  readStream >> msgChecksum;
-
-#if QT_VERSION >= QT_VERSION_CHECK(6, 0, 0)
-  const quint16 actualChecksum = qChecksum(QByteArray(msgBytes, static_cast<quint32>(msgBytes.length() - sizeof(quint16))));
-#else
-  const quint16 actualChecksum = qChecksum(msgBytes.constData(), static_cast<quint32>(msgBytes.length() - sizeof(quint16)));
-#endif
-
-  bool isValid = readStream.status() == QDataStream::Ok && QLatin1String(latin1Name) == blockServerName_ && msgChecksum == actualChecksum;
-
-  if (!isValid) {
-    sock->close();
-    return;
-  }
-
-  ConnectionInfo &info = connectionMap_[sock];
-  info.instanceId = instanceId;
-  info.stage = StageConnectedHeader;
-
-  if (connectionType == NewInstance || (connectionType == SecondaryInstance && options_ & SingleCoreApplication::Mode::SecondaryNotification)) {
-    emit q->instanceStarted();
-  }
-
-  writeAck(sock);
-
-}
-
-void SingleCoreApplicationPrivate::slotDataAvailable(QLocalSocket *dataSocket, const quint32 instanceId) {
-
-  Q_Q(SingleCoreApplication);
-
-  if (!isFrameComplete(dataSocket)) {
-    return;
-  }
-
-  const QByteArray message = dataSocket->readAll();
-
-  writeAck(dataSocket);
-
-  ConnectionInfo &info = connectionMap_[dataSocket];
-  info.stage = StageConnectedHeader;
-
-  emit q->receivedMessage(instanceId, message);
-
-}
-
-void SingleCoreApplicationPrivate::slotClientConnectionClosed(QLocalSocket *closedSocket, const quint32 instanceId) {
-
-  if (closedSocket->bytesAvailable() > 0) {
-    slotDataAvailable(closedSocket, instanceId);
-  }
-
-}
-
-void SingleCoreApplicationPrivate::randomSleep() {
-
-#if QT_VERSION >= QT_VERSION_CHECK(5, 10, 0)
-  QThread::msleep(QRandomGenerator::global()->bounded(8U, 18U));
-#else
-  qsrand(QDateTime::currentMSecsSinceEpoch() % std::numeric_limits<uint>::max());
-  QThread::msleep(qrand() % 11 + 8);
-#endif
-
-}
diff --git a/3rdparty/singleapplication/singlecoreapplication_p.h b/3rdparty/singleapplication/singlecoreapplication_p.h
deleted file mode 100644
index bc3d72369..000000000
--- a/3rdparty/singleapplication/singlecoreapplication_p.h
+++ /dev/null
@@ -1,116 +0,0 @@
-// The MIT License (MIT)
-//
-// Copyright (c) Itay Grudev 2015 - 2020
-//
-// Permission is hereby granted, free of charge, to any person obtaining a copy
-// of this software and associated documentation files (the "Software"), to deal
-// in the Software without restriction, including without limitation the rights
-// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
-// copies of the Software, and to permit persons to whom the Software is
-// furnished to do so, subject to the following conditions:
-//
-// The above copyright notice and this permission notice shall be included in
-// all copies or substantial portions of the Software.
-//
-// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
-// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
-// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
-// THE SOFTWARE.
-
-//
-//  W A R N I N G !!!
-//  -----------------
-//
-// This is a modified version of SingleApplication,
-// The original version is at:
-//
-// https://github.com/itay-grudev/SingleApplication
-//
-//
-
-#ifndef SINGLECOREAPPLICATION_P_H
-#define SINGLECOREAPPLICATION_P_H
-
-#include <QtGlobal>
-#include <QObject>
-#include <QString>
-#include <QHash>
-
-#include "singlecoreapplication.h"
-
-class QLocalServer;
-class QLocalSocket;
-class QSharedMemory;
-
-struct InstancesInfo {
-  bool primary;
-  quint32 secondary;
-  qint64 primaryPid;
-  char primaryUser[128];
-  quint16 checksum;
-};
-
-struct ConnectionInfo {
-  explicit ConnectionInfo() : msgLen(0), instanceId(0), stage(0) {}
-  quint64 msgLen;
-  quint32 instanceId;
-  quint8 stage;
-};
-
-class SingleCoreApplicationPrivate : public QObject {
-  Q_OBJECT
-
- public:
-  enum ConnectionType : quint8 {
-    InvalidConnection = 0,
-    NewInstance = 1,
-    SecondaryInstance = 2,
-    Reconnect = 3
-  };
-  enum ConnectionStage : quint8 {
-    StageInitHeader = 0,
-    StageInitBody = 1,
-    StageConnectedHeader = 2,
-    StageConnectedBody = 3,
-  };
-  Q_DECLARE_PUBLIC(SingleCoreApplication)
-
-  explicit SingleCoreApplicationPrivate(SingleCoreApplication *ptr);
-  ~SingleCoreApplicationPrivate() override;
-
-  static QString getUsername();
-  void genBlockServerName();
-  void initializeMemoryBlock() const;
-  void startPrimary();
-  void startSecondary();
-  bool connectToPrimary(const int timeout, const ConnectionType connectionType);
-  quint16 blockChecksum() const;
-  qint64 primaryPid() const;
-  QString primaryUser() const;
-  bool isFrameComplete(QLocalSocket *sock);
-  void readMessageHeader(QLocalSocket *socket, const ConnectionStage nextStage);
-  void readInitMessageBody(QLocalSocket *socket);
-  void writeAck(QLocalSocket *sock);
-  bool writeConfirmedFrame(const int timeout, const QByteArray &msg) const;
-  bool writeConfirmedMessage(const int timeout, const QByteArray &msg) const;
-  static void randomSleep();
-
-  SingleCoreApplication *q_ptr;
-  QSharedMemory *memory_;
-  QLocalSocket *socket_;
-  QLocalServer *server_;
-  quint32 instanceNumber_;
-  QString blockServerName_;
-  SingleCoreApplication::Options options_;
-  QHash<QLocalSocket*, ConnectionInfo> connectionMap_;
-
- public slots:
-  void slotConnectionEstablished();
-  void slotDataAvailable(QLocalSocket*, const quint32);
-  void slotClientConnectionClosed(QLocalSocket*, const quint32);
-};
-
-#endif  // SINGLECOREAPPLICATION_P_H
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 8cfcafaf6..40821906e 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -309,7 +309,10 @@ endif()
 
 # SingleApplication
 add_subdirectory(3rdparty/singleapplication)
-set(SINGLEAPPLICATION_INCLUDE_DIRS ${CMAKE_CURRENT_SOURCE_DIR}/3rdparty/singleapplication)
+set(SINGLEAPPLICATION_INCLUDE_DIRS
+  ${CMAKE_CURRENT_SOURCE_DIR}/3rdparty/singleapplication/singleapplication
+  ${CMAKE_CURRENT_SOURCE_DIR}/3rdparty/singleapplication/singlecoreapplication
+)
 set(SINGLEAPPLICATION_LIBRARIES singleapplication)
 set(SINGLECOREAPPLICATION_LIBRARIES singlecoreapplication)