0.2.51.21 (EXPERIMENTAL) - Clutch braking driver behaviour rewrite

Hi all,

Here's a full rewrite of clutch braking driver behaviour for the movement overhaul on the experimental branch. Allows for more complex behaviours like speed matching while shifting, as well as cleaning it up on my end.

Changes

• Reduced leaf spring stiffness by 1/3.

• Clutches are no longer engaged linearly, now following an easeInOutCubic curve.

• Made steering clutch speed faster.

• The driver now speedmatches during shifts.

• The driver no longer upshifts until it's been 2.0s until the last steer input. So the driver will be less likely to shift while manoeuvring.

• Greatly reduced engine friction. Improves coasting.

• The driver no longer downshifts during coasting. Improves coasting.

• Fixed braking not applying correctly at high speeds.

• The driver now launches in 2nd gear on flat terrain. This was more common than starting in first.

• Fixed suspension instability and flipped arms on torsion bars with low target angles and extremely long thin bars.

Nothing's changed with twin transmission driver behaviour in this one. That'll be getting a similar rewrite next.

Known issues

• Belts can clip through objects above them like fenders.

• The modded invisible track segment part used for wheeled vehicles causes a crash.

• Modded multi-tracks are broken.

• Some designs aren't working well starting in 2nd gear, will likely make this an option.

• Hamish