grafx - Extensible Java Graphics Package Code

These were minor changes made in grafx/ tree prior to releases of grafx
bundles; in particular grafx-2.0 & grafx_3d-1.0 were released on Nov 1st 2023.
Carrying these changes over to blockout/ tree. These are mostly Javadoc, but
include some use of 'final'. The Donut demo was updated significantly as well.

Fixing minor copyright date issue.

Fixing some minor code indentation issues in scripts.

Changing the naming strategy of release balls.

Removing some blank lines in scripts.

Adding script build-3d-javadoc-ball.sh.

Adding script build-2d-javadoc-ball.sh.

Adding missing copyright notices to Javadoc generation scripts.

Extracting MAJOR_TO_MINOR_RADIUS_RATIO.

Getting better control of zMax/zMin.