Adds initial intermediate qt6 porting state

qt6-after/qt6-migrated-legatus/Z/src/QtSingleApplication/qtsinglecoreapplication.h

@@ -0,0 +1,46 @@
+
+
+
+#ifndef QTSINGLECOREAPPLICATION_H
+#define QTSINGLECOREAPPLICATION_H
+
+#include <QCoreApplication>
+
+class QtLocalPeer;
+
+#ifndef QTSINGLECOREAPPLICATION_EXPORT
+# ifdef BUILD_STATIC_LIBRARIES
+#  define QTSINGLEAPPLICATION_EXPORT
+# else
+#  if defined(MAKE_QTSINGLECOREAPPLICATION_LIB)
+#   define QTSINGLECOREAPPLICATION_EXPORT Q_DECL_EXPORT
+#  else
+#   define QTSINGLECOREAPPLICATION_EXPORT Q_DECL_IMPORT
+#  endif
+# endif
+#endif
+
+class QTSINGLECOREAPPLICATION_EXPORT QtSingleCoreApplication : public QCoreApplication
+{
+    Q_OBJECT
+
+public:
+    QtSingleCoreApplication(int &argc, char **argv);
+    QtSingleCoreApplication(const QString &appId, int &argc, char **argv);
+
+    bool isRunning();
+    QString id() const;
+
+public Q_SLOTS:
+    bool sendMessage(const QString &message, int timeout = 5000);
+
+
+Q_SIGNALS:
+    void messageReceived(const QString &message);
+
+
+private:
+    QtLocalPeer* peer;
+};
+
+#endif