Freightliner Cascadia 2018 fix v1.9 1.33.x

v1.9:
- Added WPass
- Fixed interior position
- Also update to DLC addon (1.2: Added support for 2018 Christmas event prizes)
- Removed incorrect engined
- Added correct engine
- Added corresponding gearboxes
- Cleanup of textures
- Cleanup of models
- Corrected the cabins to be recognised as cabines
- Added additional Flow Below mudguards
- Added better icons for parts Separated spoilers from cabs and added them as accessories
- various bug fixes
- Changed DD engine sound to Mercedes