clean up test directory, and initial add form management tests

[PascalinDe]

This PR includes some clean up of the test directory, adds form management tests and resolves the UI part of #81

[ineiti]

I like the change from evoting to forms, but some of the elements are still evoting. Is it worth changing them to forms, too? Instead of

• json/evoting/{dkgActors,forms}
• json/{dkgActors,forms}

Edit: OK, doesn't make sense, as it follows the api-paths.

[PascalinDe]

I like the change from evoting to forms, but some of the elements are still evoting. Is it worth changing them to forms, too? Instead of

* json/evoting/{dkgActors,forms}

* json/{dkgActors,forms}

the json directory is following the API, so the documents for /evoting/whatever are in json/evoting, the documents for /api/* are in json/api