68k: MOVEM fix pre-decrement long-writes on
gg: initial support and lots of fixes
md: fix z80 mem bounds
md: the path for sram files can now be changed via prop
md: improve cram viewer
sms: add support for MEKA rom db
sms: support pause button
sms: savestate and quicksave handling
emu: reset psg on load state
sms: support backup mapper
sms: support codem and korea mappers
sms: add support for V28-V30 video modes
sms: add EU/US support
ui: fix keyboard actions