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It will allow to merge a few raw video demuxers.

 There will be some regressions, I used automatic sed replacement with manual
checks but there was a lot to change.
 It's only the first pass.

It fixes #2648.

Those multi-lines are still to be done (it's going to be fun...)
See also 5af4cc85.

This reverts commit 4774dc6c.

Input slave method needs that PCR of master and slave input use the same origin.

This reverts commit 9a90c961.
This introduces double free
I tend to prefer a memleak as a race condition rather than a crash

This improves readability a lot and prevent us from reinventing the wheel.