OSMF SVN

Updated OSMFPlayer to use the TraitEventDispatcher.

Pre-PARB metadata changes: Convert CuePointType to string-based enumeration.

Pre-PARB metadata changes: More ASDoc cleanup.

Pre-PARB metadata changes: Rename TemporalFacetEvent's positionReached property to timeReached.

Pre-PARB metadata changes: Clean up the MetadataNamespace public APIs, hide some internal namespaces. Hide a few other internal APIs.

Fixed injection due to MediaErrorCodes being re arranged.

ChromeLibrary: fixing hints from appearing at the wrong vertical offset, and preventing scrub bar time remaining calculations to go negative.

DVR: extending MediaPlayer to support DVRTrait, and adding more docs.

DVR: adding composite support.

DVR: adding ExcludeClass metadata tag.