- `allow_user_trust_override`
- `clear_cache_on_logout`

The `persistent_store` setting can now also be set to `sessionStorage`

The `trusted` settings was in effect playing the role of two separate settings
and implicitly affecting a third ('persistent_store').

By breaking it up, we make things more explicit and allow for new
configurations. For example, clearing the cache on logout, while using
some kind of persistent store.