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?)

まず、JavaFX 16 モジュールのビルドおよびバンドリングプロセスを追跡します。これには、PDE がプロジェクトを実行する方法と、エクスポートが組み立てられる方法が含まれます。提案されている modulesPath/module-list アプローチと、library.properties を介してコマンドラインオプションを追加する方法を比較します。PDE の実行とエクスポートの両方で、現在の特殊ケースのワークアラウンドなしに JavaFX モジュールが動作すれば完了です。