Allow the services navigation child drop links to work on any link field

[andybroomfield]

Currently these work for common tasks, landing child page and sublanding topic list builder.
Be handy to be able to use them on any link field.
Details TBC.

[andybroomfield]

Just noting the following

  Drupal.behaviors.uriDrop = {
    attach: function attach(context, settings) {
      var linkRow = $(".js-form-type-entity-autocomplete").closest("tr");
      linkRow.each(function() {
        this.addEventListener('dragover', function (event) {
          var row = $(event.target).closest('tr');
          var url = $("input[data-drupal-selector$=uri]", row);
          if (url.val() == '') {
            event.preventDefault();
            event.dataTransfer.dropEffect = "move";
          }
        });
        this.addEventListener('drop', function(event) {
          var row = $(event.target).closest('tr');
          var url = $("input[data-drupal-selector$=uri]", row);
          if (url.val() == '') {
            event.preventDefault();
            var title = $("input[data-drupal-selector$=title]", row);
            title.val(dragChild.getAttribute('data-localgov-title'));
            url.val(dragChild.getAttribute('data-localgov-url'));
            $(dragChild).remove();
          }
        });
      });
    }
  };