Burnside Wagon Body 1.0250

I just found the taillight fills from the Super Special Coupe mod can't align with the wagon body very well. The skin has also been quite confusing.

• Minor body UV adjustments, updated UV references
  
• Cleanup the the skin jbeam, leaving only the essentials
• Cleanup and re-arrange material.cs
• Adds a skin "Wagon 2-Tone Body"
  
  
• Adds a part "Taillight Fills Wagon" for Burnside Super Special Coupe, an taillight part for that mod with adjusted UV fitting the wagon body.