MOAR WORK.

I need to commit more frequently.

- Timer icons are tiling and drawing correctly, resolution independent.
- Clicking a timer locks it.
- Locking 3 timers at times within a half second of the first wins the
  level (no reset yet).
- Locking a second or third timer that's not within range of the first
  unlocks all locked timers.
- Timers have a placeholder shake & retreat animation on expiration
  using iTween.