System: Add a new throttler/pacer which can catch up on lost time

This can result in worse frame pacing, so if you have a decent machine
you'll probably want to turn on "display all frames" in display
settings.

But, it's sadly needed for Android.

src/frontend-common/common_host_interface.h

@@ -355,6 +355,7 @@ protected:
   bool m_turbo_enabled = false;
   bool m_timer_resolution_increased = false;
   bool m_throttler_enabled = true;
+  bool m_display_all_frames = true;
 
 private:
   void InitializeUserDirectory();