ETS2 - Semitrailers Pack V2.0

Changelog:
Update compability for 1.49

This Pack adds 4 new 12.50 meters Semitrailers:

- Bartoletti Flatbed Semitrailer
- Bartoletti Dropsides Semitrailer
- Bartoletti OSB Dropsides Semitrailer
- Viberti Curtainsides Semitrailer.

All the trailers has their own cargo, open for the flabed, and both open and covered with tent for the dropsides and Osb.
Osb trailer can also load bulk coal, gravel, ore and sand.
Curtainside trailer is skinnable and can only load closed cargo loads, all the other trailers are paintable but not skinnable.

All the trailers has the 10 wheel configuration as it was used to be in the 70's/80's and tires can't be changed to avoid errors and wrong configurations, it will be improved in the future.

Authors: - Ralf84 - Scaniaman1989 - Mixer66 - Baltazar