BulletSim: remove exception that can happen when setting physics parameters from the console.
BulletSim: zero motion on an object that we pop up because it is
below terrain. If the position is being corrected because it is out
of bounds, all other movement rules are out the window.
BulletSim: disable CCD (continuious collision detection) and
contact processing threshold since the first didn't solve tunneling
problems but used resources and the latter caused instabilities.
BulletSim: reduce the zeroing threshold for rotational velocity.
Sometimes settling of a vehicle from gravity introduces small
velocities that need to be kept.