Bundle license.xml and allowedMissingLicense.xml in a custom Maven artifact as a plugin dependency

[Tibor17]

Maven Checkstyle Plugin is able to use path to XML but it can use a plugin dependency (jar bundle) containing xml files. Similar approach should be here as well. The reason is pragmatic in big organizations which have a list of licenses in Nexus repository, similar with checkstyle.xml been in deployed artifact on Nexus.

Both configurations (artifact or current approach) should fail the build.

Both XML can be bundled in one Jar file but in two different directories in order to prevent from merging artifacts.

[smuda]

PR #21 has been merged. Check out if the result matches your request.