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Duplicate data in packages produced by jpackage #51

@nemphys

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@nemphys

I tried making a macOs .app using the jpackage functionality for the first time and, although all went well and the app works as expected, the total size of the app directory is 1.5x the size it should be (the jlink task produces a total size of ~100MB in my case, whereas the .app is ~150MB).
After checking the contents of the .app I noticed something weird:
apart from the Plugins/Java.runtime directory (which seems to include all of the jlink task results), there is a Java/mods directory, which includes separate jar files + the merged module file. If I understand correctly, all these jars are already merged inside the "modules" file residing in the libs directory (Plugins/Java.runtime/contents/home/lib) of the runtime image produced by jlink.
Although I prefer to have separate jars than the huge uber-merged modules file produced by jlink (this is another discussion, I would love to have some more info on this and whether it is optional), there seems to be some kind of duplication here.
Any thoughts would be appreciated.

EDIT: I just deleted the Java/mods directory from the produced .app and the app still launches and works fine. This verifies that the directory is unneeded and I am wondering why it is being produced. I suspect it is a jpackage thing and the badass plugin has nothing to do with it.

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