* Let preprocessors register a reordering (like c2hs)

* Reorder in all places

* Add changelog

* Add haddocks

* initialize field properly

* less indirection; use foldM

* merge

* Toggle via macro

* 3 args

* fix syntax

* Revert "merge"

This reverts commit 6a865fc6d9faccf63b2666343aba712899b7cd9a.

Co-authored-by: mergify[bot] <37929162+mergify[bot]@users.noreply.github.com>