Fixed crouch handling bug.

- Fixed accidental regression in KAI_HandleCrouching() from a previous commit.

Ripper LOF check update and new collision function

- Made the ripper line of fire check in KAI_ProjectileLOFCheck not decrement its' rip depth if one of the actors that would be ripped by the projectile is an enemy of the shooter.
- Added a new CheckTurretCollision() vehicle function, to be used in KAI_MoveTowards(). Right now it's untested and not used yet.
- Removed some debug messages.