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.