Automation Rigidification mod 1.5

Added a "compatibility mode" part for some cars, and better crash physics. Not as good at rigidification, and may require tuning in the tuning menu.

Previously some cars would export from automation with uneven floors. This meant that the normal system I used (slide nodes and rails) would hurt the car on spawn. This is especially true for vintage cars.

It also heavily modified the way cars would crash. It may have been alright to simulate rigid, carbon fibre cars, but nothing else acted nicely.

This new system uses torsion bars (as suggested by quite a few people). It's not perfect, but it's the best, simplest way of going about it without having to modify your own cars jbeam. It looks like the automation devs are seeking to fix this themselves, but in the mean time, this should work (and it'll work for previously exported cars).