Forklift compatible loads 1.2

• Added skin support to the pallet with boxes
• Fixed material on the adjustable metal box
• Added forklift compatible large cargo crate

-Added concrete bags, piles of lumber and a crate, all based on vanilla assets.
-Made some changes to the part structure to allow for different types of pallets and stuff
-Added some rigidifiers on the bottom corners of pallets
-Adjusted stiffness to try and reduce the bounciness of most pallet loads when they hit the ground
-Added triangles on the pallet's floor to help with stacking.

Removed duplicated "main" component, this should hopefully avoid issues with the pickup truck being loaded instead for some users.

This was a leftover from earlier versions of the pallet.