Revert to building a JAR

[Fancy2209]

The way we are bundling it is both cursed and unreliable, it's preventing our Actions builds from working too, so this should be looked at at some point.

[meh2481]

I spent some time this morning fixing the actions builds (it wasn't packaging the whole thing). I actually like the current output instead of building a JAR; I couldn't ever get JavaFX to package into a JAR properly, and the current method bundles a whole Java JRE so nobody has to install everything else.

If anyone wants to make it build a JAR, they can feel free to do so and I won't complain, but at the very least our builds should be working fine now.

[Fancy2209]

I mean if we get a jar, we can use launch4j and package one executable instead of the whole python folder, like Gootool!