Finitely presented categories and functors out of them #518
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The basic data structures are there, along with the beginnings of an interface for categories, but not much else.
As the names suggest, this is analogous to the `FinFunction` and `FinDomFunction`.
epatters
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This PR begins to implement the 2-category of categories, functors, and natural transformations, which has been a long-standing omission in Catlab given its central role in category theory. Much remains to be done, but here we have:
PresentationobjectsThe approach here follows the "profunctorial" design we have adopted for modeling
Set, with (1)FinCats (finitely presented categories) andFinFunctors between them, (2) arbitrary category@instances in the form of Julia types, and (3)FinDomFunctors going from the former to the latter.