Reformat all files

[Ailrun]

This is a successor of #1384.

However, some CPP modules do not work with any formatters (including stylish-haskell, ormolu, brittany), so I format them by manually removing and then re-adding CPP parts.

[jneira]

thanks! it seems the code base was following the formatter rules, not much locs

[Ailrun]

@Mergifyio rebase

[mergify]

Command rebase: success

Branch has been successfully rebased

[isovector]

Can I opt out of changes like this for tactics in the future? Splitting up imports over multiple lines severely breaks my workflow.

[Ailrun]

@isovector May I ask what kinds of workflow, if you don't mind? As we now have a pre-commit hook for formatting and will add CI checker, format will be enforced (except for hie-compat, with the justification of "we want to leave the code as close to original GHC code as possible).

Maybe #693 is a better place to discuss about.