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

Do not handle Range requests at all
This partly reverts 53474be3

Missing some cases that I could not test.
Also ffmpeg/chroma.c is locked, so I can but leave it broken.
Fix is for the remaining modules is obvious and the issue is easy to detect.

(draft-ietf-avt-rtp-and-rtcp-mux)

This saves:
 - one malloc() per packet per client } due to
 - one memcpy() per packet per client } block_Duplicate()
 - one mwait() per packet per client, and
 - one thread per client per track

So it should really help scale RTSP broadcast up.
However, in its current state, it removes the pts synchronization,
which might not be such a great idea. I will re-add it later.

Now it should not be possible to guess other people's ID.

to always include a valid server address

- always round Scale to 1 because we only support that value

([1] VoD RTSP pretends to, but it does not, does it?)

- Do not refer to bogus TTL values

Even then rtp.c is quite big...