Adds initial intermediate qt6 porting state

qt6-after/qt6-migrated-legatus/Lts/Common/LtsScriptTimeline/Test/main.cpp

@@ -0,0 +1,12 @@
+#include "mainwindow.h"
+#include <QApplication>
+
+
+int main(int argc, char *argv[])
+{
+  QApplication a(argc, argv);
+  MainWindow w;
+  w.show();
+  
+  return a.exec();
+}