Alpha Snowtrax 1.3

I updated the tree materials and paths for 0.39.

Updated some common textures that moved locations with the 0.38 update.

This fixed the tree textures that were broken by 0.37. There is still the issue with textures if you switch from this map to vanilla maps. Restarting the game fixes this issue.

A bunch of new tracks have been added!

Complete track listing:
Snowval - snow covered dirt oval with a icy apron
Figure H8 - snow covered figure 8 but the crossover is ice
Head to Head - asynchronous head to head track with asphalt and snow and crossover jumps
Race Till Destruction - bumps, jumps, rocks, overbanked turns. you get the idea
Offroad Trail - some medium duty rock crawling
Offroad Track - wide track with sweeping turns
Soap Box Hill - soap box track, but also fun with engines...