Automated checking for license

[psiotwo]

Currently, license headers are maintained manually.

The goal is to automated checking/generation of license headers. An option is the following stuff configuration which requires Java 17 however.

plugins {
   id("dev.yumi.gradle.licenser") version "1.2.0"
}

...

license {
    rule(file("codeformat/HEADER"))

    include("**/*.java")
    exclude("**/*.properties")
}