Create a new Controller class, based on an existing .fxml description file.
Very basic behaviour implemented.
Fields types are overwritten for components with ID, and overloaded methods added for event handlers. If a binding/handler is not matched to XML, it looses its @FXML annotation and if not used (and empty, in the case of handlers), it is removed from the source.
Controller is generated according to the fx:controller attribute, or if the name is missing, controller name is guessed from fxml filename.