The existing code only managed to display some windows without any functionality.

legacy macosx intf: make sure we display the right playback button graphic when drawing the video window

 * plugin cache identifier string,
 * HTTP user agent header,
 * configuration file head comment,
 * CGI server software name.

In several cases, it is not used because of atexit().

This reverts commit 8b40fb0f.
Reading the PulseAudio source code, #2538 seems wrong.

Conflicts:

	bindings/python

Nothing uses it and it is irrelevant after tree form and list form
playlist representations were joined.

- New function to copy a playlist item and all its children.
- Allow node creation at any position in parent.

Fixes #3406

This triggers a race condition and ultimately a crash when the input
kills all its children.

Ref #3406

This fixes #3377.

Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>