Enable us to render a spinner while the hook loads

Calling norwegian fnr "National ID number" makes people input their id
numbers from their home country in addition to their passport numbers.

This text change hopefully makes it clearer for our non-norwegian
friends.

Sponsosr can now click a button next to passport/fnr values on the
guest info page to see the source and verifier of the value.

Resolves: GREG-275

By using onTouched mode validation does not complain about invalid
values until the users have changed focus from the field. Doing it this
way we don't complain about values until the user tries to use an
invalid one.

Does not work for all fields. For that to be the case, we will have to
do some clean up of controlled and uncontrolled values.

The intention of the setup is to trigger a new call to userinfo after an
invite has been used to start a session in the backend. This is done by
checking a state value. Due to an oversight we did not watch the state
value itself, but instead the function used to updated it, which
obviously does not change.

Resolves: GREG-276

Using this mode we do not display any error msg before the first blur
event. This avoids errors from a partially typed email address.

Introduces the invalid field on the Identity model. The field is used to
indicate that the Identity is in invalid. This is useful when a value is
not a working value, even though the value passes validation checks,
like unused national id numbers, emails tied to non-existing domains,
etc.

Resolves: GREG-252