* draw_darken_rounded_rectangle initial commit
* image drawing routines
* mostly working static overlay
* use 24x24 instead of 32x32 images, slightly tweak some layout
* complete volume and brightness overlays
* save/load overlay
* png icons and tool to convert them to bit arrays
* add speedup overlay icons
* install common_ingame_overlay hook to all emulators
* explicitly invoke ingame overlay when saving so that the icon shows up before the pause
* make transparency look a little better on dark backgrounds
* tweak bars offset
* have pce use lcd_get_active_framebuffer
* shift sun 1 pixel to the right; even though it's just as off-centered, it looks better
