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