Added To Guardian of the forest :

- Now has a properly working shield that enables/disables itself on
  various states.
- Added a "start" function to each State Machine's states.
- Added Turn Around state so the guardian faces the player when attacking.
- Started to implement ranged attack. Guardian now fires a lightning on
  player when he is out of range, the lightning currently doesn't do any
  damage.

Also Fixed a bug where swinging log couldn't get hit.