Use registry for class setup functions #165
Merged
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While #164 works fine, I wasn't a huge fan of having to strongly couple the Hubble-specific pieces with the general class-creation method. This PR provides a solution to this - we create a registry for class setup functions, and the individual story modules can then register their particular setup functionality. We can then call all of the relevant class-specific functions from the top-level class-creation method in a generic way.