initially I read the code wrong. `demo_compatibility` means vanilla complevel, not "demo is running". for vanilla hitting 1 would switch to first only if you have berserk, otherwise it'd stick to chainsaw (provided you have it of course). that part was working ok. but for boom compat hitting 1 swaps fist and chainsaw at all times, and that part was broken: chainsaw would not get selected even if you have it.
pass button values directly (same can be done for arti)
note on using PALETTE_SIZE as offset. normally it's `256 colors * 3 bytes per color = 768`, but in our headless mode it's 256. upstream does `SDL_SetPaletteColors(screen->format->palette, playpal_data->colours + 256 * pal, 0, 256);` when palette is updated, so clearly it means offsetting by 256 colors=bytes. but PALETTE_SIZE I used as my offset is not for stuff upstream uses it for. just something better than a magic number.
passing rngseed didn't fix sync, and passing all the settings is too much work for this release. will support it afterwards.
instead just tell the user BOOM demos are not supported
there's a major slowdown when doing several res changes in the same session, and its need is questionable anyway, because of potential inconsistency of screensize across states and stuff.
feos