-Modified LoadController to allow fast playback start and increased buffer zigzag window.
-Removed unnecessary loading on timeline changes.
-Changed select message in MediaSourceManager to cause immediate load.
-Reduced default expiration time in MediaSourceManager.
-Fixed main video player not showing end time on audio-only streams.
-Fixed live stream has player view disabled after transitioning from audio stream.
-Fixed inconsistent progress bar height between live and non-live video on main player.
-Added sync buttons on live streams to allow seeking to live edge.
-Added custom cache key for extractor sources to allow more persistent reuse.
-Refactored player data source factories into own class and separating live and non-live data sources.
-Extracted expiration time in media source manager.
-Re-enabled long click on live stream info items.
-Fixed dash source building to use mpd instead of extractor.
John Zhen Mo