OSMF SVN

DVR: adding ExcludeClass metadata tag.

DVR: extending implementation details. Extending NetLoader with a time trait factory function, adding a timeTrait property to NetStreamLoadTrait, and having VideoElement use the new property on adding element traits.

Adding 'LocalFacet', removing 'LayoutFacet', and changing layout facets to inherit from LocalFacet.

Pre-PARB metadata changes: Remove ObjectFacet, Facet can be used instead.

Pre-PARB metadata changes: Merge Facet and KeyValueFacet. Default facet uses a Dictionary, clients can extend if they want a different underlying structure. Update TemporalFacet accordingly. Disable some of the TemporalFacet API that's only used for test apps, we need to vet this a bit further. Update unit tests and samples.

Pre-PARB metadata changes: Merge IIdentifier and ObjectIdentifier, rename to FacetKey. Make similar adjustments to TemporalFacet class. Move TemporalFacetEvent to events folder. Update unit tests and samples.

Pre-PARB metadata changes: Eliminate StringIdentifier, it was only used by the layout package and is functionally equivalent to ObjectIdentifier. First step in the consolidation of identifier classes.

Pre-PARB metadata changes: Rename MetadataUtils to MediaTypeUtil. Make MediaTypeUtil non-public, as it's fairly trivial for clients to check for matches on their MIME type.

Pre-PARB metadata changes: Remove MimeTypes, move specific types to NetLoader where they're used.

Pre-PARB metadata changes: Remove watchFacet methods from MetadataUtils, since clients can use a MetadataWatcher directly. Update unit tests and samples accordingly.

Pre-PARB metadata changes: Hide CompositionMode, move to compositeClasses package. Convert to String-based enum pattern.