Stronger vehicle parts (reinforced solar panel, mil-spec kitchen unit, USACE repair rig)

After reading on the forums that these parts had a tendency to break if you so much as sneezed on them, I've designed reinforced variants for people to craft.  Far more durable than their counterparts, but also a lot heavier.

Tested and seems to work, but there seems to be a bug in master with colors on vehicle parts that's generating lots of Debug errors, so it's hard to test this thoroughly.