v0.6.0-alpha

This release is primarily focused on physics. I've replaced the two-body, two-axis chassis flex system with a three-body, one-axis system. I've also added back setup options for track width (front and rear), Ackerman adjustment via tierod position on spindle, and changed the default setup for steering ratio and Ackerman to be more aggressive. There are also adjustments to the tire config and curves, including slightly slower wear rate. I also implemented SwitchPro/JPG_18's throttle model script and am using it in place of my own throttle model.

Changelog:

• Changed chassis flex to three-body system
• Adjusted many tire model parameters
• Added SwitchPro/JPG_18 throttle model
• Added Ackerman and track width setup options
• Slightly lowered aero drag
• Pushed tire wear curve out slightly
• Reparented rear axle nodes in 3D model to support rear track width and reanimated it via Lua