[xswiftbus] Make xswiftbus completely Qt free

src/xswiftbus/main.cpp

@@ -20,17 +20,6 @@
 #define XPLM_MSG_LIVERY_LOADED 108
 #endif
 
-// Change QSharedPointer<QCoreApplication> to QSharedPointer<QApplication> below
-// in case you want to have Qt Gui components inside a X-Plane plugin. The current
-// default was used since QApplication causes an infinite loop in X-Plane on MacOS
-// platforms. X-Plane is allocating an NSApplication but never calling run(), rather
-// it controls the main loop itself and pumps the event Q as needed. This causes
-// unusual start conditions for QCocoaEventDispatcher and ends up in the infinite
-// loop. Since QCoreApplication is not using QCocoaEventDispatcher it works fine
-// and is used as a workaround.
-// See https://dev.vatsim-germany.org/issues/293 for more information.
-
-QSharedPointer<QCoreApplication> g_qApp;
 XSwiftBus::CPlugin *g_plugin;
 
 PLUGIN_API int XPluginStart(char *o_name, char *o_sig, char *o_desc)
@@ -54,10 +43,6 @@ PLUGIN_API void XPluginStop()
 
 PLUGIN_API int XPluginEnable()
 {
-    QXPlaneMessageHandler::install();
-    g_qApp = QSharedApplication::sharedInstance();
-    QXPlaneEventLoop::exec();
-
     g_plugin = new XSwiftBus::CPlugin;
     return 1;
 }
@@ -65,7 +50,6 @@ PLUGIN_API int XPluginEnable()
 PLUGIN_API void XPluginDisable()
 {
     delete g_plugin;
-    g_qApp.reset();
 }
 
 PLUGIN_API void XPluginReceiveMessage(XPLMPluginID from, long msg, void *param)