[ATS] INTERNATIONAL WORKSTAR RIGID EDITION 1.37.X

Reworked International Workstar with Rigid chassis.
Have Daycab only on both - regular and rigid chassis.
Tested on ATS 1.37.x

- Added Rigid chassis with Dry Van and Insulated cargo box.
- Added cables for Rigid chassis.
- Reworked rear mudflaps for rigid chassis
- Updated Steam hanging toys accessories compatibility
- A lot of little things added and fixed.

NOTE: Compatible reworked Dolly trailer included in the package. Compatible too with Capital's Dolly and Invisible trailers but then use/enable only one Dolly trailer(this included Dolly or Capital's Dolly).