PARB feedback: Move byte events into LoadEvent.
PARB feedback: Convert ISpatial's width/height to Numbers.
PARB feedback: Update MediaPlayerStateChangeEvent.
More integration with PARB API changes.
Update a LoadEvent reference.
Update more LoadState references.
One more LoadState fixup.
Update some LoadState constants (mostly in comments).
PARB feedback: Rename LoadableStateChangeEvent to LoadEvent.
