OSMF SVN

Updated sample apps to match new IPluginInfo signature.

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.

PARB feedback: Refactor SeekEvent.

More comment updates.

PARB feedback: Rename TraitsChangeEvent to MediaElementEvent.

PARB feedback: Merge ITemporal events into one event class (TimeEvent) with three event type constants.

PARB feedback: Adjustments to LoadState (strings not classes, renamed constant values, etc.)

PARB feedback: Rename playhead to currentTime, bytesDownloaded to bytesLoaded. Affects traits, MediaPlayer, and events. Updated dependent unit tests and sample apps.

Modified Akamai plugin sample app to load MAST plugin from Akamai network. Also added missing readme.txt for the sample app.

Refactor MediaInfo/MediaFactory relationship to make factory aspects distinct from media definitions. Remove MediaElement.initialize and all of its implementations, dynamic instantiation is now handled by a client creation function. Update all dependent code (sample apps, plugins, unit tests, etc.).