Removed a useless dbg msg

Removed the 'Advanced' function from the complete prefs because we want them to be complete in any case thanks to SPrefs

Additionally, removed the temporary Simple Prefences menu item.

There is no need to reload the playlist on every single cycle of the manage thread. Trust the callbacks triggering 'PlaylistChanged' in VLCMain.

Freeze ffmpeg to revision 14080 (aka HEAD) because 'It just works'™, so we get something reliable to deal with for the stable release

On Windows, we use the Win32 for Unicode conversion. On OSX, we don't
even need to convert (and probably not on recent Linux distros either,
but they all have iconv anyway :) )

confere posix_memalign documentation