Adds initial intermediate qt6 porting state

qt6-after/qt6-migrated-legatus/Z/src/nglwidgets/nglmainwindow.h

@@ -0,0 +1,46 @@
+
+
+
+#pragma once
+
+#include <QMainWindow>
+#include <QMap>
+#include <QProcess>
+#include "nglwidgets_export.h"
+
+namespace NGL
+{
+class INGLLogger;
+}
+
+class NGLWIDGETS_EXPORT NGLMainWindow : public QMainWindow
+{
+  Q_OBJECT
+public:
+  explicit NGLMainWindow(QWidget *parent = nullptr);
+
+  virtual void setVersionView() = 0;
+
+public slots:
+
+  void onHelpIndex();
+  void onHelpAbout();
+  void onInvokeHelp(const QString &);
+  void onHelpFinished(int exitCode, QProcess::ExitStatus exitStatus);
+
+private:
+  QProcess                  *m_helpProcess;
+
+protected:
+  NGL::INGLLogger       &m_logger;
+  QWidget               *m_versionView;
+  QMenuBar              *m_menuBar;
+  QMap<QString, QMenu *>  m_menu;
+  QAction               *m_fileActionBefore;
+
+protected slots:
+  void onVersionViewDeleted();
+  void onExit();
+
+};
+