Enhanced Java and Docker support

This tagged release accumulates a series of care and feeding updates:
1. Support for Java 1.8 through Java 15 including ports from javax to Jakarta framework.
2. Updating of dependencies to more recent versions.
3. Port from the SL4J/Log4j to Log4J2 framework for logging.
4. Expanded capability for the internal authorization mechanism based on X.509 certificate DNs (this is still not 100% complete).
5. Docker & Helm support.
Enjoy!