Support cast live seekable ranges and seek to the live position. #475
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Currently the seekable range of live streams is not exposed in the CastPlayer.
The duration is always reported as C.TIME_UNSET.
This PR checks the media status of the active item for a LiveSeekableRange and exposes it over the
CastTimeline.Because the Timeline is only updated on status changed callbacks from the cast sdk (which are not send for livestream range changes) it would be outdated immediately.
To avoid this issue the
CastTimelinestores it's creation timestamp and adjusts the reported window according to the elapsed time. This is similar to the internal behavior of theRemoteMediaClient.