Add Plated

[Neppord]

In Haskell there is a concept of Plated where you can traverse recursive data structures structures.

It would be nice to have this in purescript.

I would love to help implement this, but I'm totally new to lenses and would need a mentor or a pair partner.

[Neppord]

I have started to write a implementation in a different repository, so that i can try it out, while i try to understand how to contribute code with tests into this repository.

Neppord/tree-swing@ba7b3a7