Closes #2

* AUHAL module. This module is a auhal output renderer for VLC OSX. It uses an auhal unit to do analog audio processing. This will allow us to dump the coreaudio resampler later on and will also do automatic channel reordering etc. The module currently does NOT work. The rendering callback is not functioning. I do not know how to solve the issue. I'm adding it, because it's the way to go, and I want others to be able to take a look at it and fix it. 

   get the input thread, as this does not work when called through the dialogs
   provider. Use vlc_object_find() instead.

* win32_graphics.cpp: so it should work on win32 too, now...

down but took me 2 hours to understand) Closes #106

mute icon when sound isn't mute now). Rels #106

   the Playlist control. If no image is specified (default behaviour), the
   background is filled like before, with the bgcolor1 and bgcolor2 attributes.

   the new one breaks text display on win32.
   I hope it won't break x11 skins at the same time :-)

   control