In the original stream_Demux (from 2004), there was a lock. But then
it vanished in a big input "rework"... Anyway, killing the demux
explicitly should not be needed: The underlying stream will return EOF
and any sane demux will return on EOF.

This is for backward compatibility with existing VLC playlists and
VLC playlist generators.

So the code is reusable for radio device nodes.

Signed-off-by: Konstantin Pavlov <thresh@videolan.org>

Pointed-out-by: Aurélien Nephtali <aurelien.nephtali@gmail.com>

Note that versions 1.24 and later of GNU/libidn are dual-licensed under
GPLv2+ and LGPLv3+. As with GnuTLS or Samba client, there are 3 ways
to retain LibVLC binaries under LGPLv2.1+:
 - link against a version of GNU/libidn from last year (or older),
 - do not support IDN at all,
 - use another IDNA back-end (e.g. Windows Vista's Normaliz.dll).

When there is an ambiguity, the caller is responsible for determining
whether a string is an URL or a path. In most cases, the string is
known as a file path.

Recent entries are already MRLs.

Close #7108

Close #6466

Close #6209

This should fix LP#947156.

This mostly reverts commit 7240444d.
This broke threading rules for Qt4 GUI.

Conflicts:
	modules/gui/qt4/dialogs/external.cpp

This eases matching of unknown keys.

Also do not save garbage, especially pointers, in the plugin cache.