Should show current selection little better

It will allow to removes vlc_object_find(_*) hacks.

To be used by both the 1.0-branch and 1.1. Already uploaded for all three platforms.

This really should default to off everywhere except in VLC though.

Also refactor. Deletion and loading are now distinct functions.

Note that CLOCK_FREQ is already a 64-bits integer, so the cast to
mtime_t is not needed (anymore).

This uses the PulseSupport class from phonon to allow use to support
PulseAudio nicely (e.g. nice device listings etc.)
(cherry picked from commit bf1ef7158347153310cf4644a66da14f85db38c9)
Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>