Ural Next updated for ETS2 1.31.x

Changes:
- Updated with more accurate sound(YaMZ engine sound)
- Updated with more realistic engines (YaMZ 536, 653, max.speed ~90kph)
- Updated with more realistic transmissions (YaMZ, ZF 5,9 speeds)
- Added additional Ural tire set.
- Can buy in Scania dealer at separate slot.

NOTE: Read mod description in mod manager!