Movie Window: Move customization options from Menu Bar to OSD pane, but add options to toggle the window and to open the OSD pane.

Add new setting to show/hide the Movie Window.

Source/Core/DolphinQt/MainWindow.h

@@ -208,6 +208,7 @@ private:
   void OnActivateChat();
   void OnRequestGolfControl();
   void ShowTASInput();
+  void ShowOSDWindow();
 
   void ChangeDisc();
   void EjectDisc();