* glib/dbus-gobject.c (set_object_property): split out /
	re-work, use the property type, and not the message type(!)
	(get_object_property): ditto.

        * glib/dbus-gvalue.c (dbus_gvalue_demarshal),
	(dbus_gvalue_marshal): make this code re-usable, needed
	for signals too, also on both proxy and server side.
	Re-write for more efficiency / readability.