Libretro: add gameboy printer support (save to png / real printer on DevTerm)#2886

Draft

msizov wants to merge 3 commits intomgba-emu:masterfrom msizov:feature/libretro_gameboy_printer

+132-4

Commits on Apr 16, 2023

Libretro uses COLOR_5_6_5, this fixes incorrect format in PNGWritePixels
msizov
committed
Libretro: connect GB printer and save to PNG when USE_PNG is enabled
msizov
committed
Libretro: USE_DEVTERM connects ClockworkPi's real thermal printer to GB
msizov
committed