OSMF SVN

Fix FM-982: MAST plugin doesn't show preroll for F4M resources.

Addition to fix for FM-936: Add null check when casting to NetStreamTimeTrait, since DVR elements will have a TimeTrait of a different type.

1. Remove unnecessary logic from MulticastNetLoader.as
2. Fix FM-1072
3. Fix FM-1081

Fix for FM-931

Fix FM-936: RTMP preroll briefly shows image when in SerialElement and rewound. The fix is to call Video.clear() whenever a VideoElement initiates a seek to the end. Because a seek within a SerialElement applies to all children (e.g. seek to the end causes all children to seek to their ends), we can ensure that each child's Video is cleared as soon as the playhead moves past its endpoint, so that the image is not displayed when the playhead returns to that child (through a seek or a rewind).

Fix inconsistency in autoRewind checkbox/state for ExamplePlayer.

Fix for FM-1043

Minor improvement to my fix for FM-1052, now stops the timer THEN cleans up.

Fix for FM-1052, if the last cue point is removed, the class cleans up properly and stops the interval timer.

Fix FM-1056: When FMS 3.5.3 causes a idle timeout on the client, no error is raised and the MediaPlayer stays in the READY state. Subsequent activity cause a RTE.