A lot of stuff

Adjustments to properties, constructors, and attributes of AmmoItem,
HealingItem, Player, and GunClip. SurviveGame has some item drops and a
random generator. Adjusted collision detection in humanoid, takes obj
and obj that is checking the collision, plus checks for bullets and
zombies.
Merge 2
Merge branch 'master' of https://github.com/RIT-GSD3-Survive/Survive