Network Interpolation and Prediction

No Review.

Changes:
* Add network interpolation logic to the positioning of runners, the egg, enemies, commanders, and platforms.
* Add network prediction logic to runners and the egg.
* Add Level 2 segment
 * Add optional gravity simulation to moveable platforms
* Change level manager to track and destroy all game objects related to a given level segment.
* Fix rotation synchronization of enemies.
* Fix dead enemies killing runners.