Adjustments to project Physics2D setting drastically improved tether, notably Baumgarte variables which handle hinge calculations

Added a node freezing monitor to the parent tether, which removed a lot of the jankiness to visible tether.

Tether interacts with rigidBody's, but requires 200+ Phys2D position steps to do so.  Might be optimizable.

Tether interacts with rigidBody's, but requires 200+ Phys2D position steps to do so.  Might be optimizable.