Move AUDDBG to libaudcore.
Move code to identify runtime paths to libaudcore.
Update #includes.
skins: Minor cleanup of initialization code.
gtkui: Plugin names are now translated.
Let interface plugins call Plugin::get_widget() directly, part 2.
Move equalizer code to libaudcore.
Move preferences stuff to libaudgui (but PreferencesWidget itself to libaudcore).
gtkui: Set the size of the volume button to match the other toolbar buttons.  Closes: #427.
Merge branch 'master' into lib-refactor

Conflicts:
	src/gtkui/layout.c
	src/skins/plugin.c
Update for plugin menu move.
Move audgui_format_time() to libaudcore.
Add IfacePlugin methods so that core does not need to use GTK+ or audgui directly.
Link to and initialize audgui from plugins that need it.
Add --disable-gtk option
Add --disable-vtx option
Add --disable-ladspa option
Add --disable-blur-scope and --disable-cairo-spectrum options
Add --disable-alarm, --disable-albumart, --disable-delete-files and --disable-search-tool
Use native libxml on Darwin