This makes use of the new ClientCache<K, V> mechanism, applying it to session credential objects.

This required inverting one section of the ReactiveAuthorization class. Before, the Authenticator::authenticate method accepted a Session parameter. Now, the Session::authenticate method accepts an Authenticator parameter:

The previously used method is now deprecated.

This also changes the way the OpenIdSession::fromCache works. Previously, any fromCache requests returned an OpenId credential, which incorrectly bypasses reactive authorization. In this case, the is still only a single credential, but the internal cache keeps track of which URIs have performed reactive authorization and (provided that the credential is still valid), that ID Token credential will be provided.