preliminary graphics..

macosx: icon set for the sidebar table taken from the Fogue icon set by Yusuke Kamiyamane, licensed as Creative Commons Attribution 3.0 unported (CC BY 3.0)

note: playlist view isn't connected to the side bar yet

Signed-off-by: Rémi Denis-Courmont <remi@remlab.net>

Also prefix with vlc_ for namespace cleanliness.

If a non-default UDP multicast destination port is used, it can and
should be specified through the MRL. Anyway, you should not use raw UDP
streaming ;-)

macosx: fixed volume slider appearance in black intf mode and disable the track slider when appropriate