- #7 check for stage availability on menu before positioning the dock or position once stage is available when resetting menu items.

Danielr core

- #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.