Added "About" & "About Qt" dialogs.

mainwindow.h

@@ -27,14 +27,19 @@ class MainWindow : public QMainWindow {
   void closeEvent(QCloseEvent* event) override;
 
  private slots:
+  void onAboutClicked();
   void showStatusMessage(const QString text);
+  void on_actionCheck_for_update_triggered();
 
   void on_pushButton_clicked();
-  void on_actionCheck_for_update_triggered();
 
  private:
   Ui::MainWindow* ui;
 
   GenericCore* m_core;
+
+  /// Setup functions
+  void createActions();
+  void createHelpMenu();
 };
 #endif  // MAINWINDOW_H