This mixin might be implemented by a component in order to provide cease
facilities. Cease is the zombie between stop and destroy. A sequence may be
ceased instead of being stopped. Taken an animation; an animation sequence is
stopped so it stands still to be restarted again (e.g. via a "start()"
method). It may also get ceased instead of being stopped, in that case it may
get faded out or (if it is a sprite) it may explode - so to gracefully finish
off that animation sequence.