OSMF SVN

Update project references to plugins.

IMediaResource - > MediaResourceBase.
IURLResource -> Gone.

PARB changes: Modify MediaPlayer API based on PARB feedback. Change "durationReached" event to "complete". Update unit tests and sample apps.

Updating more samples to the latest API changes.

PARB changes: Refactor MediaError to use Error as a subclass. Update unit tests and sample apps.

PARB refactoring: Rename ViewTrait's dimension properties.

Updated sample apps to match new IPluginInfo signature.

Updated minimum version requirements for plugins.

Commit of traits refactored as classes instead of interfaces. A trait now has a public API for clients, and a protected API that implementors can use to hook into the workflow. Lots of additional changes:
* Merge spatial and viewable traits
* Merge load and download traits
* Merge play and pause traits
* Refactor MediaTraitType to hold strings (consistent with PARB)

Note that the composition layer is currently disabled (CompositeElements only support the Audio and Buffer traits). There may also be some bugs in the area of HTML support.

Initial check in of the captioning plug test app.