taisel/IodineGBA

Be low power friendly when paused.

- Fixed skip boot setting being saved wrong.
- Pause/Play state is serialized properly through a round trip instead
of being assumed.
- Possible save system fix.
- Converted a throw to a proper cascade of branching.

texture filter regression fix

texture filter setting on webkit browsers was broken.

Wake the GPU thread if we need to pass a new buffer to it, so it
doesn’t have a chance to get backed up due to being throttled in terms
of wake ups by vsync.

We were drawing after every buffer copy rather than after exiting the
user callback for vsync.

Possible workaround for chrome not supporting sub workers.