TODO

- adapt to ffmpeg av_write_frame signature change (now only 2 args)
bugs:
. fix build with ffmpeg-0.4.9pre1 (av_write_frame signature change)
. get exactly one frame's worth of DAC data each frame
. convert DAC sound ourselves (SDL is broken)
. comm: send and handle pause/unpause packets
. comm support not working
. add emulator options chunk (language, colour +?)
. don't save unused/unchanging parts of Z80_regs
. exit if no ROM loaded
. fix Core compiler warnings

regressions:
. update ChangeLog for chunk snapshots, video
. disable -v if not HAVE_FFMPEG

features:
. options for snapshots (include ROM, FLASH)
. read ROM, FLASH from snapshot
. option to save 0050 snapshots?
. auto frame skip rate
. hqx i386 asm versions
. configure: test for altivec
. movie captures options: 2x, 3x, smooth, bitrates
. start/stop/pause movie capture
. event recording
. reset game
. change emulation speed (run faster/slower)
. gui menu
. speedup (sound, cpu)
. speed up 2x/3x modes