A few fixes for parrots.
- Parrots will now switch back to wander after being stuck for too long. He gets stuck because byond pathfinding procs do not take windows into account.

- Hitting parrots will no longer show the attacker the "You have nothing to drop" message. That was a typical "usr" error ... woops

- Fixed a typo or two in the comments... what? That's totally worth mentioning in the commit log!