Revolver Update

-Added a revolver to the game.

-Made the Spec Ops visor blue instead of green. This was done because it could be confused as a teammate arrow.

-Fixed shotgun killfeed icon.

-Removed UI fade.

-Navmesh fix on Corridor. Now AI bots will go through doors they refused to go through before.

-Corridor collisions fix. No more falling out of the map in certain corners.

-Changed lighting on Echo 11.