Add option to always show menu bar instead of toolbar

For those who like keyboard navigation at the expense of aesthetics.

launcher/ui/MainWindow.h

@@ -151,6 +151,8 @@ private slots:
 
     void showInstanceContextMenu(const QPoint &);
 
+    void updateMainToolBar();
+
     void updateToolsMenu();
 
     void instanceActivated(QModelIndex);