Basic Endgame

Implemented a doomTimer in enemy spawner which dramatically increases
the rate/maximum of enemies. Might introduce a switch to toggle all
enemies to automatically move towards player when spawned? Not sure yet.
Also, fixed weird issue with NPC. Also, slightly increased lifespan of
Weapon so combat isn't quite as unforgiving. I know Saul wanted to
improve how Weapon functioned, so I can defer that to him.