After Stretch has been runstopped, any Twist commands will
be rejected. However, the Twist callback forgets to release
the mode lock before rejecting the command. This leads to a
deadlock when the driver attempts to switch out of runstop.

The contact_thresh_N, contact_thresh_pos_N and contact_thresh_neg_N argument is deprecated by removing the suffix '_N' with all the move_to(),move_by(), translate_by() and rotate_by() APIs that is associated with stepper motors after the new contatc models feature introduced to the stretch_body.