December 2016 (Week 3)
+ moving blocks misbehave less, but are still on thin ice
+ optional crt shader fully in
+ another environmental hazard (firepipe)
+ first floor 4 miniboss done
+ half the floor 4 decals sprited
+ assorted fixes: floor 4 palette change, pushblock outline change, new bullet type, valves ignore damage while spinning, etc etc.