Disable full framebuffer emulation with ggpo if threaded rendering is
enabled. Would require thread synchronization on VRAM page map.
memwatch: do single lookup on page map in hit()
ggpo: Optimize memwatch and load/save state. Unprotect memory before restoring a state. Smaller timesync wait. Missing error handling.
pvr: call ggpo::endOfFrame() on vblank in only
ssa: fix warning
single-threaded mode similar to libretro core
stateful Emulator object
disable memory watcher when !gppo
ggpo: poll input as late as possible in !threaded