Implement support for handling Java “modules” and clean up JavaFX-specific workarounds

Created by: benfry

JavaFX 16 (which we're using as of 4.0 alpha 5) is bundled as a set of Java “modules,” rather than regular .jar files. As such, it will complain if the code is loaded from the usual CLASSPATH.

For now, there are some workarounds in the build process that treat the (newly separated) JavaFX library as a special case, but this is pretty gross, and we need to either:

1. Start tracking a modulesPath and module lists during build and bundling so that it can be specified when running from the PDE and when exporting.
2. Alternatively, we could add additional information to library.properties so that special command line options can be added. In this case, it would be --add-modules javax.base, etc, but could also be used to cover -XstartOnFirstThread for libraries that require that (LWJGL?)

Comienza siguiendo el proceso de compilación y bundling de los módulos de JavaFX 16, incluido cómo PDE ejecuta los proyectos y cómo se ensamblan las exportaciones. Compara el enfoque propuesto de modulesPath/module-list con añadir opciones de línea de comandos mediante library.properties. Se considera terminado cuando los módulos de JavaFX funcionan sin las soluciones especiales actuales tanto en las ejecuciones de PDE como en las exportaciones.