misc
Use <button> instead of <input type="submit" />
Move logic of array to fc entity convertor to a class.
Add wrapper flow.
Make Back and Next buttons to work.
Provide form token.
Add FormTokenHelper::getDrupalCacheId().
Include more info to form token.
Fix fatal error on loading form entity.
Add 'weight' field for pages, per there's no drag&drop to change positions yet.
Widget::render() need FieldValueItems
Save form state and reuse it.
Clear cache on final submit.
Merge pull request #12 from v3kwip/FOB-86/submit-multi-steps

[FOB-86] Form submit in multi steps