There's no reason to wait 6 sec for a reply
to a spontaneous ping. The reply has no
relation with the 5 sec keepalive ping sent from
the receiver.

The function remain fundamentally ToCToU-prone, but at least they now
follow the memory model.

Loading the open nib can take some significant time, due to audio/
video devices enumeration.

refs #12123

Stop sending and disconnect when app has changed.

close #12014

Signed-off-by: David Fuhrmann <dfuhrmann@videolan.org>

This also cleans up the images structure inside the project.

Now, new root folders are created for yosemite, with the naming
scheme mainwindow_yosemite. All icons have the prefix ys-.

Also renames 4 yosemite graphics to match the existing naming.

Signed-off-by: David Fuhrmann <dfuhrmann@videolan.org>

av_freep() requires a pointer to void *. Nothing else is defined.

Pngcrushed graphics.
close #11101
Signed-off-by: David Fuhrmann <dfuhrmann@videolan.org>

Refs #11752

awakeFromNib is no longer called on fspanel (as there is no nib anymore), so don't rely on it