Add editorconfig-maven-plugin

[TobiasNx]

Discussed with @dr0i to add check for editorconfig with https://github.com/ec4j/editorconfig-maven-plugin

I added the plugin with 1. commit to the pom.xml and 2. commit reformatted all files except the test xml and json files with mvn editorconfig:format

This does not seem to test automatically, perhaps that has to be configured. For now one has to run mvn editorconfig:check

Can you do this @dr0i

[dr0i]

Have a look at 47ba540 , there the build already fails.

I've added the mvn editorconfig:check to GitHub action - this is what is done e.g. in metafacture.

[TobiasNx]

Don't apply formatting to binary data. This may break things unexpectedly.

not sure how to do this. @dr0i can you help.

[dr0i]

Replaced by #2007. Closing.