Common files for GtkMenuShell D-Bus exporter

 GTK+ module for exporting old-style menus as GMenuModels.
 .
 Many applications implement menus as GtkMenuShells and GtkMenuItems and
 aren't looking to migrate to the newer GMenuModel API.
 .
 The AppMenu GTK+ module watches for these types of menus and exports the
 appropriate GMenuModel implementation.
 .
 This package contains common data files of the actuall appmenu module.