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Add an "object_type" field to NMPropertiesInfo, and use that with DBUS_TYPE_G_OBJECT_PATH and DBUS_TYPE_G_ARRAY_OF_OBJECT_PATH properties so that we don't need custom marshallers for each one. When creating an NMDevice or NMActiveConnection, we need to fetch an extra property first to figure out the exact subclass to use, so add a bit of infrastructure for that as well. Also, do that preprocessing asynchronously when processing a property change notification, so that it doesn't block the main loop.
cc90f101