Ball colliders, triggers, collider functions

Added collider for ball, set ball as trigger, and decrements health on
ball hit
Method headers for neutral ball

Added method headers for neutral ball event
Ball team color

Color of ball changes when the team that possesses it changes
Start throwing

Movement disabled when "throwing", but the ball is not being retrieved
properly ):
Throw Ball

Player can now throw the ball and control it while remaining in place
Code cleanup and ball pickup

-Removed unnecessary/unused code in Player class
-Parented ball's transform to player's transform to pick up ball
Ball continues moving post-throw

-Changed ball velocity in throw function so it continues moving after
player stops manipulating
-Unbind ball to player so does not move with player post-throw