Calling animation.next inside onloop callback is not working.

[ScreamZ]

@dtex @rwaldron Hello guys, hope you're well.

First issue

When using the Animation API there is no way out from onloop callback using animation.next

The next function is watch for isRunning === true and prevent going to next. https://github.com/rwaldron/johnny-five/blob/094bf6cceb8b9ec424306da8e98308ebd6fa2252/lib/animation.js#L85-L91

If we call pause right before, this is not working too because it doesn't turn running false. https://github.com/rwaldron/johnny-five/blob/094bf6cceb8b9ec424306da8e98308ebd6fa2252/lib/animation.js#L125-L138

if we call stop we clear the stack because this https://github.com/rwaldron/johnny-five/blob/094bf6cceb8b9ec424306da8e98308ebd6fa2252/lib/animation.js#L150

So we can't go to the next animation.

Only solution is to call stop and trigger a new animation from within the callback.

Second issue

oncomplete callback is not called for current animation when using stop(). But it only call onStop

Maybe we could think about something else ?