Rename groups template file.
Update style.
Split templates.
Create directory for form edit templates.
So empty-message if no page available.
Simplify entity-types selection widget.
Small CSS for available-fields.
More tweaks for available-fields.
Update converting helper classes.
Rename pageFields -> pageStack.
Change Drupal entity type name.
List field groups.
Rename template files.
Rename template files (continue)
Display an empty element if group has no field.
Rename files.
Remove a field in group.
Include group-helper to builder app.
fieldOnDrop does not need $event param.
Add notes for groupOnDragField().