Added: Biped Template > Added an additional controller for bending the back using rotation (spine_mid_ctrl).
Added: Biped Template > New rotating space for head_ik control: spine_fk_ctrl.
Modified: Biped Template > All tip joints are now locked by default after Finalization.
Fixed: Biped Template > Rotating the left leg in Windows caused the IK Spline to rotate incorrectly in some cases.
Fixed: Biped Template > The central spine controllers are now properly mirrored using the Selector.
