switch over to libpicofe
- libretro should not be affected by this, all others need to do
'git submodule init && git submodule update' from now on.
- pandora should get gamma control support
- [DBH] frontend/common/fonts.c
- [DBH] frontend/common/fonts.h
- [DBH] frontend/common/in_sdl.c
- [DBH] frontend/common/in_sdl.h
- [DBH] frontend/common/input.c
- [DBH] frontend/common/input.h
- [DBH] frontend/common/lprintf.h
- [DBH] frontend/common/menu.c
- [DBH] frontend/common/menu.h
- [DBH] frontend/common/plat.h
- [DBH] frontend/common/posix.h
- [DBH] frontend/common/readpng.c
- [DBH] frontend/common/readpng.h