Annotate files with a copyright notice

[deemp]

Details

The #534 introduced a CI job that checks copyright notices in multiple files.

This job fails if some notices are missing or incorrect.

We need that files that the job checks to be annotated with copyright notices so that the job doesn't fail.

Here's the list of files that currently cause errors.

Subtasks

• Add copyright notices in the files that cause errors
• Update this function so that it additionally inserts copyright notices into .phi files after copying the files. It's necessary for these generated files. UPD: we don't need to insert comments into .phi files - see let's add copyrights checker to CI pipeline #450 (comment).
• Learn which license should files generated by BNFC have.
• If the license required by BNFC is different from LICENSE.txt, create another step in the copyright job Add copyrights checker #534. This step should check the license required by BNFC specifically in Print.hs and Abs.hs. Don't check these files against LICENSE.txt.
• Update the script in Setup.hs so that after running BNFC it reads the appropriate license file and inserts the copyright notice in Print.hs and Abs.hs. Ensure the license file is in the eo-phi-normalizer directory and is specified in extra-source-files.