Adding 'Vote Up/Down' field to a panel

I was trying to add the widget as a field in panels, like you can add the node title, body, ... rather than creating a separate content type for it (although that would indeed also be an option). I noticed Fivestar does this (ie. you can add a Fivestar widget as a content type without needing to create one yourself), and thought it would be neat if this module could also do that.

I did some digging today, and I think that the reason why the widget isn't being displayed in Panels is because CTools is missing formatter settings. If you look in ctools/plugins/content_types/entity_context/entity_field.inc (which turns an entity's fields into content types), line 118, there is:

$field_output = field_view_field($entity_type, $entity, $field_name, $field_settings, $language);

For the 'Vote Up/Down' widget I added, $field_settings doesn't contain a settings array, which (should?) come from ctools_fields_get_field_formatter_settings_form() on line 193 of entity_field.inc.

I'm not sure if CTools' entity_field.inc requires an implementation of hook_field_formatter_settings_form() (in vud_field.module) to be able to do this, but I'm guessing this may be the case.

Changing title to avoid confusion with vud_node module.