-improved audio output and small audio emulation fixes and improvements

-added support for one of the multicarts I own because why not
-various small updates regarding the libretro hook, including better handling of rom switching and saving

fix compiler warning

-fixed playback for some gbs music files

-implemented APU zombie mode for volume control
-corrected several CPU instruction timing details
-properly implemented OAM DMA with all its timings etc
-corrected some memory bugs and improved timer accuracy
-added basic serial I/O control support as some games rely on its interrupt
-improved PPU accuracy and implemented STAT DMC bug required for some games

unzip files

GBC BIOS support and support for older colorization hacks, see README…

… for details

GBC BIOS support and support for older colorization hacks, see README…

… for details

more GBS compatibility

push version

use short audio output by default now, it is good enough

-keep audio float output as default and allow short output via a comp…

…iler option instead

-added short clipping to prevent ugly clicks in the audio