This release is particularly aimed at mitigating the Log4Shell vulnerability by updating the logging framework used.

Upgrade / update libraries, including GraphQL, which is now at v16.

Update Java code to match new libraries and to follow Java 8+ style better.

Add checkstyle.

• Remove Maven and rely solely on Gradle in order to build consistent artifacts
• Enable build to an executable JAR and prefer this mechanism
• Travis CI (Thanks to SkypLabs)