* Specify state provider for currently active user
* Split active and single user States
UserStateProvider is still the mechanism to build each State object.
The SingleUserState is basically a repeat of GlobalState, but with
additional scoping.
* Fixup global state cache
* fix fakers to new interface
* Make userId available in single user state
* Split providers by dependency requirements
This allows usage of the single state provider in contexts that would
otherwise form circular dependencies.
* Offer convenience wrapper classes for common use
* Import for docs
* Bind wrapped methods
