See
http://forum.videolan.org/viewtopic.php?f=32&t=100612&p=339220&hilit=media_add_option#p339267
and
http://forum.videolan.org/viewtopic.php?f=32&t=99357&p=333659&hilit=media_add_option#p333659
for reference.

Unremoved Unlock introduced by 874efde6

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

This fixes #6773
Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>

no user-visible change. However, we save 29KB and don't need to update that graphic for HiDPI

macosx: Cocoa cannot deal with 2 images of the same name in a single bundle even if their type is different

Hence, rename one of them.

Note that the @2x artwork is missing at the moment, so there will be artifacts in the main window and the about panel

Notably the ones with vorb/flac with ssa/srt

close #4358

refs #4358

macosx: fixed table column duplication by moving the dynamic column generation from VLCPlaylistCommon to VLCPlaylist, where it belongs (close #6928)

This reverts commit bd0ae7ec.

Seems a problem with signals, but without test cases I can't fix
it for now.