PSCi currently relies on purescript-console, but for teaching purposes, I would like to be able to use purescript-preface with PSCi, for example.

I don't know how to support this, but I think it would be good to be able to support different sets of core libraries.

Perhaps we can do something like we do with rebindable do notation, and rely on some name being in scope. Maybe we need to also make the $PSCI.Support module available for import.