That should help failing safe to software decoding if the graphic card
has too little free memory. Old cards with only 256 MiB are commonly
affected by that problem.

This seems necessary to maintain the mapping of libav's packet stream
index to the VLC plugin's tracks table offset.

strncpy triggers warning because the
struct is nonzero terminated.

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>