VideoCommon: Added an option to showcase internal resolution, EFB width x height as screen overlay. Option to turn it on is a checkbox in screen on the OSD settings, in debug. This supports enhancements.

Source/Core/DolphinQt/Settings/OnScreenDisplayPane.h

@@ -25,6 +25,7 @@ private:
 
   // Performance
   ConfigBool* m_show_fps;
+  ConfigBool* m_show_internal_resolution;
   ConfigBool* m_show_ftimes;
   ConfigBool* m_show_vps;
   ConfigBool* m_show_vtimes;