Refactor FullTextSearch into a plugin and a widget.
Finishing up widgetization of FullTextSearch

* Use new demo URL
* Move projectionCodes into widget.
* Add an applyposition event to the widget.
* Add change log note.
* Update example with a search-tip element as an example of setting up a tooltip.
Merge pull request #569 from pagameba/refactor-fulltextsearch

Widgetization of FullTextSearch