Justin/player animations

NOTE: USE REFACTORED PLAYERCONTROLLER IN SCRIPTS FOLDER FROM NOW ON!

Added AnimatorController + 5 animation states to represent idling, walking forward/backward, and running forward/backward
Added transition logic between states that means the correct animation plays at the correct time
Changed player movement script to account for idle, moving animations
- Added CharacterController-based movement
Locked enemy y-position to bullet height so that player can shoot enemies

jsalim-neu / cs3540-final