OSMF SVN

PARB changes: rename LayoutRendererMode to LayoutMode. Set modes to be "none", "vertical" and "horizontal". Updating units tests and client code accordingly.

PARB changes: make calculateContainerSize @private.

PARB changes: changing LayoutProperties.snapToPixel to be true by default.

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.