[Playlist] some extensions, timing and meta tracks

[Sebastian Pipping]

Lucas Gonze wrote:
> Your idea is to use this as a performance instruction to the player:
> "Player, perform rendering for $duration milliseconds."

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Would it be okay for a player to read <duration> from
the playlist, display it as duration for the track
and update it to the exact value when the track is actually
played? It would not be an instruction then.



Sebastian