Reorganized Ai behavior system
Implemented examples for behaviors and a multi-behavior controller
Merge remote-tracking branch 'origin/master'
removed old enemy ai classes
revamped  light and weaken scripts for new AI system

Anything with the WeakensInLight  will be slowed if collides a trigger with IsLightSource
CanMove now supports scaling up/down it's move force and max speed
updated enemy and light source prefabs for new AI behavior system

enemy_prefab - added new behaviors, CanMove , WeakensInLight and removed old IsWeakened
light source - added IsLightSource