054a169be0
Refactor D14646 to use context.active_action for the Action Custom Properties panel, matching the already existing Action panel. This has the advantage that it allows access to the properties of any actions with channels visible in the Dope Sheet, e.g. Shape Keys, Materials etc; while using just the active object is limited to just the object animation. Also move both panels from Item to the Action tab. Differential Revision: https://developer.blender.org/D15288