DECISIONS TREE CLASS:
- Made lots of members private to remove Unity warnings
- Removed parameters we didn't need from a few functions

ENEMYAI:
- Few structural changes, BuildDecisionTree seems to work in start() now
- Now denoting actions with "a_ACTIONNAME" and decision with
  "d_DECISIONNAME".  Easier to read!

So Smart

Not finished, brain is quitting - will come back to! (Collision script)

Space for attack E for Block

Main scene with walking animation, doors to other scenes but bug when
exited. (appear at random door)