Blender Git Loki

Hack: Let gizmos draw during playback to force VR gizmo redraws that way

We have to somehow force VR gizmos (i.e. the virtual camera) to
continuously redraw. Until there's a proper way to do that (e.g.
continuously redrawing certain gizmos without redrawing the rest of the
3D View), just allow playing animation to force these redraws.