Small update: rigs and fixes — Shack Animator 2D Indie Steam update #6896477

Small update: rigs and fixes Rig gizmo: joints no longer spin erratically when rotated. Smoother 3D rig animation: joint rotations between keys no longer flip. Reset pose: put the whole rig or selected joints back to the rest pose, also from the Rig Hierarchy right-click menu. Rig Hierarchy: a delete button for each constraint (keys stay in place), tidier rows. Posing: a missed click no longer drops the rig, clicking a bone line picks its joint, and joints of other visible rigs can be picked. Group opacity now fades everything inside the group. Fixed detached panels not docking back into the main window. Fixed a speckled outline on reference wireframe meshes with anti-aliasing on. Fixed the file association check.