[STABLE] Enemy (Goomba), MultiCoin Block, And Collision update

This is a pretty big update.

New Goombas!
New MultiCoin Block (Image file loads how many coins are in the
multicoin block; can have up to 16 coins)
Collision code generalized a bit more from just Mario. Stress testing
produced results of being able to have up to 100 entities at one time
(once they get "activated"/"triggered" in the level; excludes the
player). This will probably continue to get more fine tuned as to not be
so hard coded so it can serve a stronger purpose for other entities down
the road.

MapManager was discovered to be useless.

Thought to be bug, turned out to be my fault. Didn't know what
alwaysrender was actually for until I found out it keeps rendering ALL
StateBasedGame states regardless of which one is currently selected.
This is now removed as to stop weird effects of timers and whatnot.

Other small bug fixes were added as well.