* feat: extend to support a selector attribute identifying the DOM element to be used as the drag handle
* fix: remove redundant variable declaration
* fix: remove extranneous variable declaration
The change brings it into line with the format in TransculdeWidget. I think it's OK to link to the tiddler defining the widget from the tiddler.
The ListWidget tiddler uses a different convention, "The list widget" : for consistancy I think all widgets should contain a WikiLink to themselves in the introduction