Frame skip

[fengb]

Right now, each GB frame advances per requestAnimationFrame so any frame skips would cause a realtime timing mismatch. In addition, the Gameboy runs at ~59.7hz, which should be ~0.5% slower @ 60hz or ~58.5% slower @ 144hz.

At the bare minimum, we should do a timing diff and advanced the frame by real-time instead of frame-time.

FUNDUDE should also have a "consistent" mode that doesn't frameskip on 60hz, and somehow works well on 144hz.

[fengb]

Closed by 861d005