The entity class for this instance of Nymph.
A simple map of names to Entity classes.
And optional PubSub client instance.
Add your class to this instance.
This will create a class that extends your class within this instance of Nymph and return it. You can then use this class's constructor and methods, which will use this instance of Nymph.
Because this creates a subclass, don't use the class
getEntityClass to check with
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