Since the old keys used to be strings i started out by
json serializing the new keys with type, value, rev.

However storing serialized json in couch (json) does
not really make sense. So now we do not serialize but
instead have one json document. The lookup for a key of
type pgp may still return a string but for everything
that uses the new api it will return a hash with type
and revision.

This data structure is way easier to handle also on the
nickserver side.

We used to just ignore the key.
Also separated the code for handling key updates from other
user updates. This should eventually be moved to a different
route. Mixing the two makes the implementation really hard.

feat: allow unauthenticated access to list of configs

Closes #8800

See merge request leap/webapp!45

fixes #8801

Includes a test reproducing 500 on lynx

We now make use of ActionController::Parameters require and permit
methods.

This should simplify client code significantly according to
platform#8849

We now use the hash of the token for comparison and as the id.
In order to use it you need the original token though. So forms and
thus the session should have token.to_s rather than token.id.

If you inherit respond to and call it again in your controller
it will not overwrite the previous but add to it.

Since we always have some exceptions from the rules it's probably
easiest to be explicit in the controllers that require it themselves.

for him/herself

So that it we do not expose the is_admin property to anyone else
including other admins.