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Pruning by time was removed a while ago, but
pruning by segment number only can't work for pruning the whole
playlist as that number can be inconsistent across representations
and streams/adaptation sets.

Pruning by number should only occur merging/at representations level.

And add implicit discontinuity on format change.
Use only tracker events to change state (will need to move currentchunk away)

Since smooth adds new segments from segments data,
we need to resync for unselected streams.

And avoids creating stats from non http chunks (smooth)

Can now flush buffers on demux restart.
Do align pcr after sending to decoders instead of always incrementing
by the target value (avoid dropping blocks across segments on restart).
Always issue a fakees to demuxer, then recycle on execution.
Avoids double deletion with duplicate Del commands (demuxer 0..n+self n).
Can now handle HLS discontinuities.
Drops the streamoutput layer.

Since we can swap formats, some doesn't provide any or same values

simplifies

Since we have no real way to drain stream demux fifo,
we should have a way to reset demuxer before switching to
a new segment.

should appear smoother