Move lyrics providers to own thread

src/lyrics/lyricsprovider.cpp

@@ -19,7 +19,6 @@
 
 #include "config.h"
 
-#include <QObject>
 #include <QString>
 
 #include "core/shared_ptr.h"
@@ -28,3 +27,11 @@
 
 LyricsProvider::LyricsProvider(const QString &name, const bool enabled, const bool authentication_required, SharedPtr<NetworkAccessManager> network, QObject *parent)
     : QObject(parent), network_(network), name_(name), enabled_(enabled), order_(0), authentication_required_(authentication_required) {}
+
+bool LyricsProvider::StartSearchAsync(const int id, const LyricsSearchRequest &request) {
+
+  QMetaObject::invokeMethod(this, "StartSearch", Qt::QueuedConnection, Q_ARG(int, id), Q_ARG(LyricsSearchRequest, request));
+
+  return true;
+
+}