Removed unused #define from Biped, clarified description
Renamed UpdateOrientationVelocity -> SetCalculatedVelocity

The original name didn't really make sense, since it had significance
only in the case of the AutonomousVehicle - for Bipeds, the velocity is
divorced from their orientation.
Unified tool classes under a single namespace
SteerForCharacterEvasion refactor

- No need to subtract the vehicle's velocity when fleeing.
- Replaced an unnecessary ?: use with Mathf.Min