[ATS] MAZ 504/515 [1.31.x]

MAZ-504/515
- Independent
- Spelled out in two separate slots in MAN for ETS 2 and at Peterbilt for ATS
- Four cabins
- Two salons
- Three chassis
- His sound
- His whees and tires
- Four engines
- Tree gearbox
- Tuning
- Support SISL`s accessories

This modification is based on MAZ-515 from Fox071rus.

NOTE: Not tested on betas.