gb: re-enable emulation, sound is much better
68k: update lib, subx.l flag fix, movem changes
jinput: disable polling thread by default
md: msu-md support
md: support SEGA SSF system type, force load SSF2 mapper
md: rework sram detection
nes: rework audio wrapper, reduce audio popping
sms: fix savestate handling
ui: detect user changing screen
z80: savestate to store regI too