Add script to automatically format code before merging PRs

[Xeeynamo]

I was planning this PR since months, but I never pushed it as I knew it would cause a major pain at rebasing and merging. But as lately more and more people are forking and making changes to the project, I can not really delay this any further.

This PR adds an Action that automatically creates commits that formats the code based on the specifications in the .editorconfig. The commits that fixes the formatting will look like this.

[Xeeynamo]

I am marking this PR as ready to be reviewed. There are no many reasons to hold this back any longer.

I highly suggest to merge this only after #457 , #416 and #458 to avoid conflicts.

[Vladabdf]

Closing, but the branch will remain in the event this is actually useful and can be cleaned and merged later on if necessary. (It seems pedantic to me.)