Add fatModueJar tasks that re-packages module Jars in indivudal folders and adds launcher code

[jjohannes]

This allows users to create a "Fat Jar" without loosing module information.

• Use the structure supported by: https://github.com/raphw/jenesis-launcher
• Configure build.jenesis:build.jenesis.launcher as default launcher, but allow users to provide their own launcher code if it can work with the same structure
• Parallel to the jpackage task, there should be one task per-target - libraries like JavaFX or LWJGL would require different native modules for different target platforms.