macosx: implemented playback controls for the detached video window (bwd/play/fwd, position, time, fullscreen)

2 things todo:

- get custom artwork for the fullscreen button

- implement window title when using the black ui mode

Signed-off-by: Hugo Beauzée-Luyssen <beauze.h@gmail.com>

Fixes #6261
Signed-off-by: Hugo Beauzée-Luyssen <beauze.h@gmail.com>

close #6252
Signed-off-by: Felix Paul Kühne <fkuehne@videolan.org>

macosx: fixed resizing issue, which was in part fixed by the previous commit by accident (close #6203)

Make sure that if we would resize beyond the screen we set the origin values to ensure that the complete window is visible.
Signed-off-by: Felix Paul Kühne <fkuehne@videolan.org>

This reverts commit 3effe298.

Make sure that if we would resize beyond the screen we set the origin values to ensure that the complete window is visible.
Signed-off-by: Felix Paul Kühne <fkuehne@videolan.org>

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

i_physical_channels only uses PHYSMASK bits anyway.

There is no reliable way to determine the channel configuration of a
certain ALSA device. The ALSA operates at too low level for that.
So add a configuration option with default to stereo (as in previous
VLC versions). However, the user will not need to re-enable 5.1 every
time.

This commit also removes all the fancy device choices. The static
choices are overriden dynamically by the UI anyway. So the only use of
the list was in vlc --help.