Add non-escaping show functions

[Francesco Ariis]

Hello Kai,

Il 19 dicembre 2021 alle 17:53 Kai Ma ha scritto:
> This proposal benefits ghci without breaking any existing code, and the
> older behavior can be restored by `:set -interactive-print print`.

Just to check if I understood correctly: only ghci will benefit from this
proposal, right? Are there other place where printNE/showNE could be useful?
Why not a new typeclass instead of modifying the venerable `Show`?