Selective memory refresh optimization

[rebane2001]

Right now, every variable is refreshed on every clock cycle, which is slow, and the main bottleneck holding everything back.

I think it might be possible to selectively target blocks of memory, eg:

--region128: paused;
@container style(--clock:3) and style(--addrDestA >= 128) and style(--addrDestA < 256) {
  --region128: playing;
}

and then have a separate animation for every region of memory.

This would have a lot of animations playing at once instead of just two, and I'm not sure if this would work, but it might be a massive performance win if it does!