OpenDingux: Attempt to optimise the display of borders by stopping to draw them when it's certain that all of the back buffers of the surface have no remaining image from the menu (green) or progress screen (black).
OpenDingux: Implement a fast-forward hotkey and save it to the configuration file. Also fix up button mappings if nothing is bound to a GBA key or the Menu action.
OpenDingux: Fix self-overlapping FPS counter caused by commit 9d0e7a5405882c9ce982b5b0e79cb2f45612ad8f.
OpenDingux: Improve fast-forwarding. Better detection of the need to increase frame skipping when there is insufficient buffered audio, and to raise the frame rate again once a fair amount of time has passed without audio underruns. This may help the Dingoo A320.