- #629 if start has been dispatched already prevent dispatching many begin events.
- Fixes for #15

- #15 add cache busting to the file being checked for availability to play back correctly once resolving has completed.

- #614 when the clip ends if the next clip in the provider has a different provider close the provider stream.
- #627 only detach / attach the display on start events which causes issues in buffering events after a seek in stagevideo.
- #627 re-enable stagevideo state change listeners if stagevideo is available or detach the fullscreen events on first call.