[Archi 5] Move to Java 17

[Phillipus]

Archi is currently targeted toward Java 11 (LTS) and ships with a bundled version of JRE 11. It seems that some Eclipse projects are now moving toward a minimum of Java 17 so it's inevitable that we will have to move to 17 as well at some point.

Java 17 does not include Nashorn which is one of the scripting engines in jArchi. Options will be:

1. Remove the preference options for Nashorn and use GraalVM only
2. Ship stand-alone Nashorn with jArchi - https://github.com/openjdk/nashorn/

Option (2) can be done, but adds more dependencies to jArchi. Maybe we should make this clear now and drop Nashorn?

[Phillipus]

Some references to Eclipse using Java 17:

https://github.com/eclipse-platform/.github/wiki/PMC-Meeting-minutes#august-10-2022---mq-jay-alex-tom-lars

eclipse-platform/eclipse.platform.swt#175 (comment)

eclipse-m2e/m2e-core#891

[Phillipus]

We have to move to Java 17 to support the latest Eclipse features and build from Tycho. I'll ensure that jArchi has an optional stand-alone Nashorn bundle.

Aiming for Archi 5.