Add strong epimorphisms and strong monomorphisms#296
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This PR implements another part of #267 by adding strong epimorphisms and strong monomorphisms.
Basic results are added (and as usual, they are dualized automatically):
This has already decided the properties for all (well, there are not so many) morphisms in the database.
Moreover, an example of a strong epimorphism which is not strict (and hence, not regular) has been added, the evident functor I → Idem as a morphism in Cat.
This is unrelated to the new properties, but the universal morphism has been added as well.