Implement focus chaining from inside Chromium items to outside Qt Gui items

Currently if you try to press the Tab key while a WebEngineView has focus, the focused item inside the view will be changed, and once the final item is reached, the focus will start over from the first focusable item inside the view.

It is not currently possible to stop the wrap-around inside the view, and give focus to the next Qt item after the view.

Suggestion is to introduce a new setting, that will allow choosing whether the focus should be passed to the next Qt item, or to wrap to the first web item inside the WebEngine view.

Can be tested with recipebrowser example.