Instead of manually putting together the phone number and hoping we get
it right, we instead format the number using the phonenumbers library.
This library is already in use for validation, making it the obvious
choice. This means that the backend will only receive E.164 formatted
phonenumbers from now on. In addition, we now ensure that the number is
in fact a mobile phone number.

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.