Build a Java 9 Multi-Release JAR about indriya HOT 5 CLOSED

Not sure, if we need this, currently module-info could be all we need, unless future Java versions came with changes to the API or RI that are so beneficial, we better jump on them. Value types could be such case, but JEPs like http://openjdk.java.net/jeps/169 or http://openjdk.java.net/jeps/218 have the lowest priorities and are not even assigned to a JDK version either.

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While a Multi-release JAR was not necessary at this point, Jigsaw has now been fully integrated by Indriya

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Reopening this as a basis for new language features e.g. in Java 12

from indriya.

@desruisseaux, do you know, if the AntRun plugin you used for https://github.com/unitsofmeasurement/unit-api could have two or more identical goals, one for Java 9 special artifacts, the other for Java 12?
I tried https://github.com/metlos/multi-release-jar-maven-plugin locally with Indriya and it works reasonably well, but the first additional JDK (9) gets not only the module-info under the META-INF/releases folder, the entire Java 8 codebase is also duplicated there. Plus OSGi Bundle seems incompatible with the multi-release plugin. We may be able to do something different like Bnd, but
if the AntRun approach could work here, it might keep the effort and JAR size (which otherwise gets up to around 500kb instead of 256) a bit smaller.

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Some of the AntRun option is also documented here https://blog.loof.fr/2018/06/multi-release-jar-with-maven.html

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