Replaced the models that were removed from the game recently.

6/16/13 - Version 3 update.
ADDED VERSUS MODE.
Various fixes, details, and enhancements. Probably some unhancements.

Version 2 changes:
In short, added random weapon spawns, including magnums and melees, and defibs. Ammo piles are now spaced more easily. Items are more visible. Fixed the alarmed door event in level 2.