Add an observer onto a component's dynamic options

[DanRathbun]

Note I also discussed this at least 5 years ago …

List side-effects of a component attribute change

Attribute changes cause the EntityObserver#onChangeEntity callback to fire for any Entity sublcass object the observer is attached to. You could also attach such an observer to the “dynamic_attributes” dictionary object, of a specific entity as well rather than having it fire for every change of the owner object. (This works because dictionaries are themselves a subclass of Entity.) But, yes you’d still need to snapshot them, or create a copy of the entire dictionary to start with, and then c…