Marvin Scholz authored Jun 16, 2016 and Felix Paul Kühne committed Jun 17, 2016

This adds two wrapper classes:

- VLCRendererDiscovery
  Wraps libvlc’s vlc_renderer_discovery and allows a delegate
  to receive add and delete notifications for renderer items.

- VLCRendererItem
  Wraps libvlc’s vlc_renderer_item, is used by VLCRendererDiscovery
  to conveniently wrap the vlc_renderer_item to use them easier in
  Objective C.

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