Mantis arms update

230321: kemono version and no joint deform for regalia version now included.

The kemono has three versions; one which is only rigged to the arms and is stiff, one which is rigged to the arm and hand bones and the last version uses its own joint positions but does not work with the kemono's default animation deforms. You can remove the kemono's deforms by disabling the scripts in it but your shoulders will look odd.