* Make CI work again (GHC 8.0 - 9.12)

While updating the `tested-with` field in `pretty.cabal`,
I did some cosmetic fixes.

* CI: disable benchmarks again

* Complete .gitignore

* Try fix Haskell CI

* Hand-written CI using cabal

* Haskell CI: disable tests and benchmarks (cyclic build constraints)

* Cabal CI: disable tests and benchmarks

* Fix problems in .cabal file

* Extend Cabal CI to windows and macos