OSMF SVN

FM-848: adding unit test that holds the code to reproduce the reported bug.

Updating VideoQoSPluginMetadataSynthesizer to create comma separated string values for all of the available keys.

Second code submission for bug FM-760, add unit tests to increase code coverage.

OSMFPlayer/QoSPlugin: adding 'dropped frames' field, and switching plug-in to seek out the proxied element's NetStreamLoadTrait in order to get the internal stream info.

ChromeLibrary: adding rudimentary support for loading plug-ins defined in XML.

More minor ASDoc cleanup.

More ASDoc updates, making terminology more consistent.

Back out changes to FM-823.

Fix bug FM-836 and FM-823

For FM-836, there is a problem with HTTPNetStream when an external buffer manager changes the bufferTime of the stream to be larger than 3.75 for fast bandwidth and 7.5 for slow bandwidth. When OSMFPlayer runs into buffer empty event, the buffer manager will increment the bufferTime. After a few empty buffer events, the bufferTime will be larger than 3.75 or 7.5, at which point the next buffer empty event will put FP into the buffering state but never comes out because HTTPNetStream will stop downloading fragments and send the tc messages to appendBytes. The fix takes the bufferTime into consideration and choose the max of buffer time and 3.75/7.5 as the threshold.

For FM-823, we set the default to enable enhanced seek.

Various ASDoc updates (no code changes):
- Use consistent style/terminology in class declarations of MediaElement subclasses.
- Usage should steer towards MediaPlayer rather than traits.
- Fix a few items that should be @private.
- Describe composite behavior for all traits in composite class headers.