Owned Silo Trailer Feldbinder 1.34

Features of the initial release:
- stand-alone, ownable-only trailer
- chassis configurations liftable/non-liftable
- compatibility with SCS accessories (wheels, mudflaps)
- new accessories for side+back reflective stripes in different colors
- AO baking of frame+body
- new paint system allows separate customizable colors for frame and body
- template for skinning
- new body_type
- freight market offers freight like cement, sand et al. for this body_type
- SCS company paintjobs