OSMF SVN

Adding missing TestVerticalAlign and TestHorizontalAlign classes.

PARB changes: splitting layout alignment property into verticalAlign, and horizontalAlign. Removing registrationPoint property, and its enumeration class. Adding VerticalAlign, and HorizontalAlign enumeration classes, and updating unit tests and client code accordingly.

Extending ASDocs

Separate RTMP and HTTP switching logic, via different metrics providers. Extract switching logic from HTTPNetStream into standalone switching rule based on download ratio. Make terminology a bit more consistent. Clean up APIs. Add tests for download ratio checks.

1. add multiple BootstrapInfo support
2. add fragment discontinuity support
3. modify unit tests accordingly

Updating OSMFPlayer to the changed layout APIs, adding a comment, and fixing MediaContainer from ignoring its constructor argument.

PARB feedback: remove layoutRenderer and parentLayoutRenderer properties from ILayoutTarget.

Changing deep iteration on measurement and layout to be ILayoutTarget driven (so the renderer will no longer require a reference to a ILayoutTarget's layout renderer).

Changing targets to now be responsible for setting the correct parent on their own layout renderer. Introducing LayoutTargetEvent that defines a number of events that can be fired on a ILayoutTarget in order for it to keep reference of its parent and container renderers.

Updating unit tests accordingly.

Restore manual switch mode default to false. But always set it to true at the NetLoader level, so that the switching manager can handle the transition logic.

Reorg of dynamic streaming classes. Separate RTMP rules from core MBR classes by placing them in an "rtmpstreaming" package. Allow clients to add switching rules to NetStreamSwitchManager via the constructor. Initialize switching manager differently for RTMP and HTTP. Still an open question as to whether we should keep DynamicStreamingNetLoader (or subsume it into NetLoader).

Remainder of fix for FM-383: Ensure that when SerialElement (via TraitLoader) attempts to load the next playable child (on child transitions), it takes into account the possibility that the LoadTrait of a child that it's loading will be replaced by another LoadTrait (which would then become the one it needs to load). Also updated the CaptioningProxyElement to use a higher listener priority so that it ensures that the SerialElement doesn't think that the load is complete when transitioning from child to child. (This is a necessary step for clients who use the swapping LoadTrait trick, but there might be a more robust approach to the same problem.)