Replay playback changes:

- Store level state periodically
- Load the closest usable level state when done rewinding for
  quicker resumes
- Make playback menu fade out after 5 seconds of no activity
  (but not while paused)
- Remove wrapping from replay hut (original wrapping was broken
  at some point before 1.1 and it's not necessary anyway)
- Allow holding enter on frame advance for noisy slow-mo

from fickleheart