Merged Battle Controller and Item folders.
Merged all three branches together.
Eliminated attackRange variable for Character class.
Massive Level refactoring and additional AI classes.

The Level class no longer uses a Dictionary of Vector2, Character pairs
to locate the characters.  Each Tile has an occupant variable to keep
track of the Character on the space.  The AI classes give variety to the
types of enemies to play against.
Fixed conflicts with previous commit