Build release binaries using jpackage

[msgilligan]

Use the jpackage util (still in pre-release but working well for me) from JDK 14.

If the app is converted to JPMS modules (see #85) we could use the Badass JLink Plugin (which is also working all for me on another project.) Otherwise we could use the Badass Runtime Plugin (which I haven't used but is by the same author as the Badass JLink Plugin.)

What are your thoughts? I might be up for making a PR for you to consider.