empowerops implementation of `runImmediately` for javafx

SyncingUtilities.java

public class SyncingUtilities {

    //...

    public static void runImmediatelyOnFXThread(Action actionToRunOnJavaFXThread) {

        if (BootstrappingUtilities.isFXApplicationThread()) {
            actionToRunOnJavaFXThread.run();
            return;
        }

        Ref<Throwable> exceptionRaisedByJavaFXAction = new Ref<>(null);
        CountDownLatch latch = new CountDownLatch(1);
        Platform.runLater(() -> {
            try {
                actionToRunOnJavaFXThread.run();
            }
            catch (Exception | AssertionError error) {
                exceptionRaisedByJavaFXAction.target = error;
            }
            finally {
                latch.countDown();
            }
        });

        try {
            latch.await();
        }
        catch (InterruptedException e) {
            throw new RuntimeException(e);
        }


        if (exceptionRaisedByJavaFXAction.target != null) {
            ExceptionUtilities.throwAsUnchecked(exceptionRaisedByJavaFXAction.target);
        }
    }
}