* gdk/Gdk.metadata : hide Property.Get for manual impl. * gdk/Property.custom : manually marshal the data param in Get. svn path=/trunk/gtk-sharp/; revision=80684
* gdk/Property.custom : obsolete compat overload for Change(). * gdk/Gdk.metadata : array attr for Property.Change (). * gdk/Makefile.am : add custom file. svn path=/trunk/gtk-sharp/; revision=80245