* Java 16 preliminary branch.
This compiles, but junit tests fail all over because there is a lack of
Java 16 support right now.
* Use Java 16
* 1.17 WIP
* Require 1.17
* Fixes tests.
* WIP fixing tests
* Exclude maven from shading
* Try update snapshots to build action
* Try repo on command line
* Remove reference to shade plugin in dependencies