showAboutDialog
fun showAboutDialog(what: String, version: String = Info.VERSION, image: Image = TUPROLOG_LOGO, width: Double = TUPROLOG_LOGO.width * DEFAULT_ICON_SCALE_RATIO, height: Double = TUPROLOG_LOGO.height * DEFAULT_ICON_SCALE_RATIO): Optional<ButtonType>
The default onAbout handler: shows an informational Alert naming what, its version, and the running JVM/JavaFX versions.