Refine Behavior Tree

Minor fix for v0.2

• Refined the AI behavior tree as per FSM.
  
• Keyboard debugging:

1. Force AI reset
2. Make a noise for the AI to investigate (same as jumping)
3. Damage AI causing it to chase/attack the player.

Week 1 - Building the world / actors / behavior tree. - complete

Week 2 - Refine behavior tree for multiple tasks. - complete

Week 3 - Create Combat Controller system

Week 4 - Refine Combat Controller to manage multiple AI 

Week 5 - Fault finding and bug fixing

Week 6 - Polish