JBIDE-15640 BrowserSim: use JavaFX WebView as a browser engine

- adding necessary javafx mock files
JBIDE-15640 BrowserSim: use JavaFX WebView as a browser engine

- adding inspector-front-end files
 JBIDE-15640 BrowserSim: use JavaFX WebView as a browser engine

 - adding support of javaFx WebView to CordovaSim