OSMF SVN

PARB changes: LayoutRendererProperties, remove "ment" from horizontal- and verticalAligment. Set MIDDLE constant to "middle". Updating unit tests and client code accordingly.

PARB changes: updating OSMFPlayer and plug-in sample.

PARB changes: Move all MediaElement subclasses into the "elements" package. Put internal classes into non-public subfolders (e.g. audioClasses). Update unit tests and sample apps. Remove VAST unit tests from OSMFTest, we should integrate VASTTest into the build system.

Adding inline documentation to the control bar plug-in sample.

Updating sample to have its root-element use an absolute width and height. This ensures that the control bar shows in the right position, regardless of the video content being available yet.

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.

PARB feedback: rename LayoutProperties to LayoutRendererProperties.

Moving ControlBarPluginSample and Test into the plug-ins folder.