Preview is fairly basic, and only shows players
rewinding. Full state is restored via reloading
the replay and jumping to the timestamp once
the rewind is done.

This will have other goodies on it later!

1 Player now goes directly to Time Attack, and Extras
is now a submenu with Unlockables, Statistics, and a
currently-dummied option for Replay Hut.

This allows people to watch replays without the characters loaded,
without making everyone be Sonic.