SNG 4 (+ Blue Front)

This mod adds a realistic SNG 4 to the game.
A new middle coach was adapted from the one in game.
A variant with a blue front has also been added
The full list of variants added is:
SNG 3 (Blue Front)
SNG 4
SNG 4 (Blue Front)
Issues:
Collision in middle coach of SNG 4 is a little funky
SNG 3 (Blue Front) cannot be spawned using sandbox menu, use god mode
Thanks to Elena for doing the numbering
Update: Fixed model issue in new B car