Outdated 6.0L and 6.7L Diesel for D-Series 1.8 patch, for game 0.19

- New diesel sounds across all rpm range for diesel 6.0L and 6.7L.
- Converted transmissions to use new beamng update 0.10 standard.
- Fixed problem caused by beamng update 0.10. of auto transmission being slow to up shift.

For bonus content - experimental transmissions and more now.
- added weighted left and right toolbox for d-series bed. (standard, 300lbs & 600lbs options)
This can aid in better rear traction, and also help stabilize the truck when towing heavy trailer (Just an added option for simulating a weighted bed)