Color & wheel color, added tires & terra tires, added power choices.

Version 1.0.0.1
- now has normal and Metallic colors, body/rim
- option to disable the screws on the front mudguards (someone missed this while designing it :D)
- changed tire pressure on nokian. less deformed.

Alex blue's tires inspired me to give xml & editor a go, this is the result. do whattever you want with it. happy farming!