Added EnemyState enumeration

Added enumeration with the four states an enemy can be in: Search,
Track, Attack, and Kamikaze. Also deleted old txt maps
Implemented enemy finite state machine

Enemies seem to successfully change states, but since the methods are
empty at the moment, the only sign of a changed state is that they don't
move once they see you.
Added Track, Attack, and Kamikaze logic

Added some simple logic and also a color for the three other states.
Small fix for Kamikaze state transition.