OSMF SVN

Reverting changes made with rev. 15538.

Add filtering tagging for asdocs

Fix for FM-707: Formalizing the prohibition of adding a single media element to multiple composites. Changes encompass:

* Extending MediaElementEvent with a PARENT_CHANGE type, and 'parent' property.
* Having CompositeElement fire a PARENT_CHANGE event when adding or removing children.
* Having MediaElement listen for PARENT_CHANGE events, storing a private reference, throwing an exception ("Error: Element is already a child of another composite element") when the current parent is not null.
* Adding error message to OSMFStrings.

Make DVRCastNetLoader public again as intended

Fix ExamplePlayer bug exposed by capability change event fix (FM-696).

Fix bug FM-696: Capability change events being dispatched after the trait to which they refer has been modified. Updated unit tests.

Fix bug FM-678 and FM-717.

Remove unreachable code.

Extend MediaPlayer unit tests.

Extend unit tests for NetStreamSwitchManager. Remove unreachable code.