Sed-replace CRLF files

Test that the last line `--help` is the name of the config file

Ensure that the last line of the help text is the name of the config file.
This invariant is used by clients such as the Haskell setup github action.

See: https://github.com/haskell-actions/setup/pull/63

Switch from criterion to tasty-bench

Makes builds faster by eliminating 10 transitive dependencies:

* base-compat-batteries
* binary-orphans
* cassava
* code-page
* criterion
* criterion-measurement
* Glob
* js-chart
* microstache
* Only

Add a format rejections function

Leave commentary that goPReject and goPSkip reverse the order of instances

- Is for instances, Vs for versions

The earlier output was from cabal-install-3.10.2.0 compiled using Cabal-3.10.2.1, from ~/.ghcup/bin/cabal

Add conflicting versions of pandoc to repo but not all of them as there are so many

- Take account of hyphenated package names
- Don't shorten a singe rejection

Fix Monoid instances for ForeignLib & Executable

The Semigroup and Monoid instances for ForeignLib were completely
broken: for the `foreignLibVersionInfo` and `foreignLibVersionInfo`,
we essentially had the following:

  mempty :: Maybe XYZ
  mempty = Nothing

  (<>) :: Maybe XYZ -> Maybe XYZ -> Maybe XYZ
  _ <> b = b

which is obviously not a valid Monoid, as `Just x <> Nothing = Nothing`,
violating the identity law.

The Semigroup instance for Executable was also deeply suspicious, as
it combined the module paths, which makes no sense. Now we instead error
if the two module paths are different (and both nonempty).

Fix wording of haddock-project help and curate list of commands