Form Repeat sortable support for drag/drop events

Boilerplate for extending App Connect components is:

dmx.Component('form-repeat-ext', {
  extends: 'form-repeat',

  // extended properties and methods here
});

The above will create a new component named form-repeat-ext and will extend all properties/methods from form-repeat. With the above code it is simply a clone of form-repeat since no properties are extended.