Better Idaho

I always though that Idaho could've been such a nice looking car, if it wasn't for it's terrible back. So I changed to my liking.
While I was at it I made it so that the roof is just an extra part, that doesn't need to spawn, just like Stallions roof.

Recommended car colors are mostly taken from Pony and can be found in readme.txt.

My first mod. It's a lot of fun. I hope I'll make more in future.