Improve fields

* Rebuild uitests after kiwi forms changes

* Migrate some widgets on deliveryeditor to use forms and avoid ugly interfaces

* Use OrderedDict instead of a normal dict. We are only able to keep fields
  order because CPython implementation will usually keep dicts ordered, but
  that's not guaranteed.

Change-Id: I52af89b846333a57c689ed23926ec16d8ae00ded