Experimental Man TGS Accessories 0.6

• Added "tow_hitch" couplers to secure pallet and crate loads in the AN-12 (Requires AN-12 Securement mod)
• Added support for the experimental parachute prototype.

The following cargo toys were added:

• Concrete barrier
• Refrigerator
• Piano
• Log

Added new package container:

• Standalone version - Implemented as its own vehicle
• Palletized Version - Implemented as a forklift-compatible load

Added crane-compatible versions of the shipping containers and the forklift compatible loads

When the new T-Series was released, the trailer coupler tags hanged from "fifthwheel" to "fifthwheel_v2". This prevents the TGS from hitching up to trailers. Fifthwheel_v2 upfit mods are added to this kit, which reenables trailer hitching.