AtkObjectFactory subclass with a GType. Note:
The associated factory.type will thereafter be responsible for
the creation of new AtkObject implementations for instances
appropriate for type.atkRegistrySetFactoryType(object, type, factory.type)objectAtkRegistry] the AtkRegistry in which to register the type associationfactory.typeGType] an AtkObjectFactory type to associate with type. Must
implement AtkObject appropriate for type.