Blender Git Loki

Apply collision responce on state before pre-collision solve (breaks selfcol)

This uses the pre-collision solve result only to find the collisions and
calculate the responce impulses, but rolls back to before the
pre-collision solve when it is time to actually apply the responce.

This prevents the cloth from undergoing a double solve per time-step,
which essentially made colliding clothes move much faster than
non-colliding clothes.