Support for JDK 9, 10 and 11

[autermann]

Todo:

• [ ] Find a solution for additional dependencies to be declared depending on the runtime JRE
• [ ] Fix the maven-notice-plugin to read the license mappings with the right namespace. Right now, the plugin requires under JDK 8 that the namespace is present and JDK 9+ requires that there is none. The JDK 9+ profile injects a duplicate of the license mapping...
• [ ] JavaDoc generation currently fails:

  [INFO] --- maven-javadoc-plugin:3.0.1:jar (default) @ shetland ---
  [ERROR] Error fetching link: /home/autermann/Source/arctic-sea/janmayen/target/apidocs/package-list. Ignored it.
  

  The JDK 10 javadoc tool only generates the element-list files but no package-list but seems to expect the old one...

[07tAnYa]

Is this issue still open?