Fix failing test case (Stackage failure).

Fixed test discovery and arg overriding.

ignores/modules options and deprecations.

Docs fixes and upper bounds loosening.

Minor docs and clean ups.

Deprecate `case_` and add `--tree-display`.

Hackage fixes

Follow the tasty-auto way. Big refactor.

Add new `--ignore-module` option.

Bump Cabal version.