OSMF SVN

Second phase HDS refactoring
- added a factory class for streaming objects ( HTTPStreamingFactory ) which any HDS implementation must extend
- removed mixing code from HTTPStreamingFileHandlerBase and its derived classes
- updated private events related to HDS to make them more consistent
- adding source handler to manage both index handler and file handler
- removed enhanced seeking from HTTPNetStream ( temporarly )
- removed permanently MBR logic from HTTPNetStream

IMPACT:
- no public API was affected

*NOTES*
- LBA is still not working
- unit tests and integration tests fail
- DO NOT USE IT EXCEPT IF YOU ARE TESTING THIS

First phase HDS refactoring - extracting the URLStream downloaded in a separate class.
- *NOTE* LBA is not working anymore

HelloWorld9.as internal assets add

Fix RTE when switching between stream with/without LBA ( when stream in unloaded )

Attempt to improve playback experience on HDS late-binding on audio

Fix an infinite loop in HTTPNetStream introduced by change list 2099

Fix for FM-1264 ( http://bugs.adobe.com/jira/browse/FM-1264 )

Partial fix for FM-1267 (http://bugs.adobe.com/jira/browse/FM-1264)

[LBA] Fix FM-1266 bug (http://bugs.adobe.com/jira/browse/FM-1266)
- when LightVideoElement was unloaded ( through processUnloadingState), the ALTERNATIVE_AUDIO trait was not properly removed.

HelloWorld9.as committed for bug reproduction