Replace typedef with using

ext/gstmoodbar/gstfastspectrum.h

@@ -47,7 +47,7 @@ class QMutex;
 
 typedef void (*GstFastSpectrumInputData)(const guint8 *in, double *out, guint len, double max_value, guint op, guint nfft);
 
-typedef std::function<void(double *magnitudes, int size)> OutputCallback;
+using OutputCallback = std::function<void(double *magnitudes, int size)>;
 
 struct GstFastSpectrum {
   GstAudioFilter parent;

ext/libstrawberry-common/core/messagehandler.h

@@ -82,8 +82,8 @@ class AbstractMessageHandler : public _MessageHandlerBase {
   AbstractMessageHandler(QIODevice *device, QObject *parent);
   ~AbstractMessageHandler() override { AbstractMessageHandler::AbortAll(); }
 
-  typedef MT MessageType;
-  typedef MessageReply<MT> ReplyType;
+  using MessageType = MT;
+  using ReplyType = MessageReply<MT>;
 
   // Serialises the message and writes it to the socket.
   // This version MUST be called from the thread in which the AbstractMessageHandler was created.

ext/libstrawberry-common/core/workerpool.h

@@ -76,8 +76,8 @@ class WorkerPool : public _WorkerPoolBase {
   explicit WorkerPool(QObject *parent = nullptr);
   ~WorkerPool() override;
 
-  typedef typename HandlerType::MessageType MessageType;
-  typedef typename HandlerType::ReplyType ReplyType;
+  using MessageType = typename HandlerType::MessageType;
+  using ReplyType = typename HandlerType::ReplyType;
 
   // Sets the name of the worker executable.  This is looked for first in the current directory, and then in $PATH.
   // You must call this before calling Start().