0.2.51.28 (EXPERIMENTAL) - Fixes

Fixed tanks sliding at stand-still, introduced with the tension changes.
Fixed track belts not colliding with objects above the track (actually fixed this time).
Engine idle RPM is now automatically configured.
The engine shift range used for the transmission warnings is now the top half of the engine's usable speed, instead of upshift - downshift.
Adding new gears now copies the last ratio to the new gears, instead of attempting to smooth it from G1.
An error is now displayed if the driver is unable to upshift due to too large of a gear step.
Downshifts no longer have their speed match forced below the engine's rev limiter. So downshifts can fail now if your downshift is too high.