Vehicle wheels velocity synchronized.
Removed UpdateVehicle API, not necessary.
btWheelInfo parameter for vehicle raycasters
Check for invalid numbers in the collision dispatcher in debug builds
Fill in some code for new buoyancy calculations
Keep track of the fluid current velocity
Whoops! Remove UpdateVehicle API from the interface too.
Implement vehicle handbrake and modify the steering code
Remove 2 friction directions, change Simulate deltaTime logic