Animation enhancements

[Brian Hudson]

I would love to see "Animation needs more events" resolved [1].

Maybe following events: started, paused, resumed, cycleStarted, cycleEnded,
stopped/ended? These additional life cycle events would allow me to do some
things with animations/transitions that I've been struggling to do.

There may even be use cases events for starting, pausing, resuming,
cycleStarting, cycleEnding, stopping/ending.

[1]: https://bugs.openjdk.java.net/browse/JDK-8092408