Apply updated license headers

[stes]

Please merge #117 first. This PR applies new license headers to all files, based on the config in #117 .

The commit is done via a bot account, so the cla check might fail as before. This is done to keep the contribution counts correct.

[cla-bot]

Thank you for your pull request and welcome to our community. We could not parse the GitHub identity of the following contributors: CEBRA.
This is most likely caused by a git client misconfiguration; please make sure to:

1. check if your git client is configured with an email to sign commits git config --list | grep email
2. If not, set it up using git config --global user.email email@example.com
3. Make sure that the git commit email is configured in your GitHub account settings, see https://github.com/settings/emails

[stes]

looked through the files, looks good. the pre-commit made a few minor corrections to three changed files (minor formatting or whitespace) which I would also keep included in this commit.

[stes]

This notice,

is expected due to the bot account.

[cla-bot]

Thank you for your contribution. We require contributors to sign our Contributor License Agreement (CLA). We do not have a signed CLA on file for you. In order for us to review and merge your code, please sign our CLA here. After you signed, you can comment on this PR with @cla-bot check to trigger another check.

[stes]

@cla-bot check

[cla-bot]

Thanks for tagging me. I looked for a signed form under your signature again, and updated the status on this PR. If the check was successful, no further action is needed. If the check was unsuccessful, please see the instructions in my first comment.