Crandon International v1.4.1

This update is for the finish line grids going back to vanilla. There may have been other small changes here and there, but it's been quite a while since I last tweaked the map, so I don't remember exactly what was changed.

Custom ground race surface models
The main race surface is an intermediate point between the default dirt and mud models, as the track is wet before the race, but it is not fully saturated.
the inside of the overlay corners and seating areas are made from more slippery but slightly deeper mud. This mimics the pooling of water that typically occurs in these areas.
the edges of the track and the outer edges of the turns are composed of looser dirt. This simulates the accumulated dirt that is thrown out.