Additionally, fix a leak

It did not work at all anymore.

This will be used by the radio tuner.

This also allows to set QTSound as an input slave for QTCapture to capture both ES at the same time. (close #6851)

The VLC UIs use the VLC configuration instead of variables. That way,
updated values are propagated immediately, rather than when a video
output is created.

Since the snapshot-related variables have no callbacks, they only need
to be created if and when they are overriden/set. This only occurs with
the LibVLC media player snapshot function (which remains quite broken).

This targets the same issue as 5b8a4057, but in a saner approach

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

items stored in a xib should only interacted with after its loaded, which may be after NSApp is

This is more coherent with the rest of the worlds...

AppKit could be accessed by a non-main-thread

extras/package: disable the macosx dialog provider in VLC.app release builds, since it should only be used by VLCKit

Signed-off-by: Felix Paul Kühne <fkuehne@videolan.org>

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