Resolve #228

This currently adds support for useEffect like execution to the useSignalEffect, this is supported by means of a new options second argument, which is an object that allows you to pass in a property named mode. By default we will do sync execution which is the behavior we have seen before, but we also allow for a new type of behavior, namely afterPaint which is the same method used as useEffect.

Currently I did not really see a need to add useLayoutEffect but we could in the future, for React we could implement this like the following:

export const useSignalEffect = (cb, opts) => {
  const [effectTrigger, setEffect] = useState(0);

  const effectFlush = useRef();
  const callback = useRef(cb);
  callback.current = cb;

  useEffect(() => {
    const notify = () => {
	if (mode === 'afterPaint') {
		setEffect((e) => e + 1)
	} else {
		eff.flush();
	}      
    }
    const eff = createFlusher(() => callback.current(), notify);
    effectFlush.current = eff.flush;
    return eff.dispose
  }, Empty);
  
  useEffect(() => {
    if (effectTrigger > 0) {
      effectFlush.current()
    }
  }, [effectTrigger]);
}

Do note that this would only trigger after updating the DOM-node if the relevant property is used on a DOM-node as well

demo