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.

This hinders the following commits. This was only used in a single
plugin on a single platform, and was poorly designed.