listener.unlisten() in examples?

[dakom]

The listener created in the widget examples, e.g. https://github.com/graforlock/sodium-typescript-examples/blob/master/examples/ex1/SLabel.ts, has no corresponding unlisten()

Is this intentional? In the Java version there is an explicit unlisten() e.g. in removeNotify() at https://github.com/SodiumFRP/sodium/blob/master/book/swidgets/java/swidgets/src/swidgets/SLabel.java

[graforlock]

Feel free to tinker around and submit a PR whether something's not right.

I don't have too much time to fix it as of yet. Would appreciate some help.