Fixed Porsche 944, now a normal version, but probably still not final.

Improvements:
- New configurations;
- PBR, improved light, improved materials;
- Improved suspension, made the characteristics of the engines similar to the real ones, added a motor model;
- New sound;
- Added 4 sets of wheels, a set of bumpers, racing seats, two types of steering wheel;
- I removed the dummy parts;
- Redesigned configs;
- Minor improvements on zhibim.