0.2.51.19 (EXPERIMENTAL) - Movement overhaul — Sprocket Steam update #139317

Hi all, Sorry for the wait! This was a tricky one There's an experimental build of 0.2.51 up on the experimental branch This time powertrain and track behaviour have seen a full overhaul. Main Changes The powertrain simulation is now much more realistic. Moved the track simulation off of PhysX into an in-house solution. This allowed for in-depth rolling resistance and bump-stop simulation and paves the way for more factors like weight dispersion to be simulated. This moves a lot of the physics work onto other threads. Track collisions are now belt-based instead of wheel-based. Allows the belt under the sprocket and idler to provide traction and suspension. Added a new traction model. It's now more realistic and allows track slipping, skidding and drifting. Clutches are now more realistic, with a maximum torque trans...