OSMF SVN

Checking in Subclip work in order to be able to work on bugs. This code has been tested, and includes some unit testing. More unit testing to follow.

Fixed bug where canSeekTo(0) wasn't checked before the auto rewind code in play was called. Fixed 347.

Fixed bug where the timeOffset wasn't calculated for streaming content - this has now been generalized. This fixes an issue where the complete duration != currentTime when complete is fired.

Integrate with API change.

[dvr proto] reinstating VideoElement clause that instantiates a DVRCast trait.

[dvr proto] integrating trunk changes.

[dvr proto] integrating trunk changes.

[dvr proto] integrating trunk changes.

PARB changes:

Removing MediaContainerGroup. Exposing the inner layout renderer publicly in order to facilitate container nesting. Updating NestedMediaContainers sample accordingly.

Overriding display list management functions on MediaContainer to throw an exception on direct invocation. As a result, layout renderers are no longer capable of adding display objects onto a container, but this is resolved by LayoutRendererBase now emitting events requesting display object (un)staging or index adjustment. LayoutTargetSprite and MediaElementLayoutContainer have been updated accordingly.

PARB changes: making add, remove and contains methods public on the ASDocs. Refraining from adding shielding for adding custom display objects to the sprite, for a LayoutRenderer must be capable of doing so.