New Actros plastic parts and more v2.4.4

Change log:
Version 2.4.4 (2016.01.16)
! Fixed wrong def files for quick job and desktop trucks

Truck based on truck from game version: 1.22

Future plans:

- More (originally plastic) painted parts.

- SCS Blender Tools conversion of truck model too.

- Some modified parts.

Authors:

davidzoli, Flemming V and Capital (tandem chassis)