Adds initial intermediate qt6 porting state

qt6-after/qt6-migrated-legatus/Z/src/nglapplication/nglcoreapplication.h

@@ -0,0 +1,31 @@
+
+
+#pragma once
+
+#include <QtCore/QCoreApplication>
+#include "nglloggerhandler.h"
+
+#ifndef NGLCOREAPPLICATION_EXPORT
+# ifdef BUILD_STATIC_LIBRARIES
+#  define NGLCOREAPPLICATION_EXPORT
+# else
+#  ifdef MAKE_NGLCOREAPPLICATION_LIB
+#   define NGLCOREAPPLICATION_EXPORT Q_DECL_EXPORT
+#  else
+#   define NGLCOREAPPLICATION_EXPORT Q_DECL_IMPORT
+#  endif
+# endif
+#endif
+
+namespace NGL
+{
+class INGLLogger;
+}
+
+class NGLCOREAPPLICATION_EXPORT NGLCoreApplication : public QCoreApplication, public NGL::LoggerHandler
+{
+  Q_OBJECT
+
+public:
+  NGLCoreApplication(int &argc, char **argv);
+};