Break up ClaimForm (sip)

 - Break up ClaimForm into ClaimDetailForm, ClaimTypeForm, and ClaimOutcomeForm
 - Dummy view to illustrate how to build views for new pages

Once @demwunz is done with the views, I'll change the tests and the flow of the
form for the new code, and also remove the old code.

Tasks

- [x] Break up claim form into smaller forms
- [ ] Views
- [ ] Amend tests
- [ ] Remove old code