Extend JavaFX launcher support to allow full JavaFX launch feature set

The current launcher support for JavaFX is limited to starting only the main JavaFX application class. We need to primarily allow support for preloaders and additional jars on the classpath. We can accomplish this by enhancing the JavaFX LauncherImpl class (we will require that work to be done first) then passing the jar file path and application arguments to the new method so the FX launcher can gain access to the jar file itself and perform whatever steps are necessary to launch the app.