Mod Audi RS7/A7 [Fix version] 3.12(Beta) for BeamNG.drive

Highlights
1:fixed Driving Safety System
(If it doesn't work,pls clear cache and delete old version)
2:modify .jbeam and .pc file to change the Wagon body both at body style and information 
3:modify some part's value to make it more sense
4:small things...