- Remove black lines below podcast controls
- fix uncentered dropzone when starting native fullscreen, by slightly
  increasing the min height
- fix disappearing or uncentered dropzone when changing between
  normal and minimum view quickly
- consolidate dropzone and podcast sizings in interface builder

This image was set, but it is not overwritten by its os-dependent
counterpart in code. In fact, we only have one image, so just unset
the alternate image in xib.

This especially fixes the -on graphics.
Signed-off-by: David Fuhrmann <dfuhrmann@videolan.org>

Clang does not fail, but only prints a warning by default for unknown
-W options.

VLC supports groups where mp4 defines switch groups.
As an es can't belong to multiple groups, but does in
switch groups, we don't really have a way to provide
the same track exclusion/alternative features without
duplicating es.

Priorities are then set in a way es/tracks from the same
cat/switchgroup are not all selected.

refs #3970

Follow the spec and correctly handle text encoding

And fix reading

And enforce handler

Those two callbacks only exist in wl_output version 2. VLC uses
version 1 only so far.