Animation: Do not dynamically update from/to

- Tile animation was updating it's from/to on
  load:times, to match the new available times.
  This should not be the TileAnimation object's responsibility,
  as it causes behavior changes that the client UI may not expect.
  Let the client application decide when and how it wants to change
  time bounds.
- AnimationSync was changing it's from/to based on
  individual tile animation's from/to. Again, this should be
  the client's responsibility.
Turn off animation preloading
AutoUpdateAnimation: trigger 'autoUpdate' when times are loaded

instead of waiting for all layers to load
AnimationSync: bubble-down chnages to from/to
TODO