* refactor(Logout): rely on hooks for mutation behavior
* fix: logging out now correctly resets cache, disallowing any cache mixing between the next logged in user on the same browser
* chore: remove additional localStorage values on logout
* refactor: move endpoint services to own directory
* refactor: make endpointconfig handling more concise, separate logic, and cache result for subsequent serving
* refactor: ModelController gets same treatment as EndpointController, draft OverrideController
* wip: flesh out override controller more to return real value
* refactor: client/api changes in anticipation of override