Compatibilty with JPMS

[tomprodehl]

As Java migrates to modules, support for modular artifacts becomes more important. Producing jmod files or modular jars as inputs to jlink will become required as older version of Java eventually are retired.

[asashour]

This needs moving classes to different packages, so either deprecation is used, which is then removed with later versions, or this is totally restructured in version 3 (not sure about its plan).

[tomprodehl]

My understanding is that moving classes to different packages is not necessary, one needs to define a module and define what it requires and what it exports.