GTA 4 Rancher Collision Model Fix

Some of you may have noticed that the Rancher in GTA IV has some collision issues, namely the front bumper will crash into obstacles even though visually there's enough clearance. This mod remodels the collision model to make it closely match the visual model to give the vehicle realistic approach angle and departure angle. I made this fix using openFormats I/O so no camera bug and messed up tire normals associated with ZModeler.