demux: fix rar support for files containing DTS audio tracks

With a recent cleanup, rar support was stuffed into demux_playlist.c
(because "opening" rar files pretty much just lists archive contents and
adds them to a playlist using a special rar:// protocol, which will
actually access the rar file contents).

Since demux_playlist.c is probed _after_ demux_lavf.c (and should/must
be), libavformat was given the chance to detect DTS streams embedded
within the rar file. This is not really what we want, and a regression
what happened before rar listing was moved to demux_playlist.c.

Fix it by moving the rar listing into its own pseudo-demuxer, and let ir
probe before demux_lavf.c.

(Yes, this feature still has users.)

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