Remove mp4ff-based AAC plugin.  Move iTunes cover art support to ffaudio.  Closes: #425.
Use C++ enum syntax.
Add support for dual GTK+Qt build.
qtui: Tweak open files dialog
qtui: Add menu bar (wip)
qtui: plug hook callback leaks
qtui: add 'About' and 'Quit' actions.

('actionAbout' is not connected as we do not have libaudgui-qt yet.)
qtui: add playlist action placeholders
qtui: fix opening entire directories with the file dialog
qtui: implement many playlist menu actions
qtui: process PLAYLIST_UPDATE_STRUCTURE updates
qtui: update playlist tab titles as part of the culling phase
qtui: port statusbar code from gtkui
Merge pull request #25 from kaniini/master

miscillaneous qtui fixes
Initial version of the Mac Media Keys plugin
Don't automatically disable important plugins.  Bump required neon version.
Limit the Objective-C check to OS X.
skins: Set _NET_WM_STATE_SKIP_PAGER on playlist and equalizer.
Link against libc++ only
console/sap: implement new TIME tag support