* Rename SpaceListScreen to SpacesScreen
To avoid confusion with the SpaceRoomListProxy.
* Rename SpaceExplorerFlowCoordinator to SpacesTabFlowCoordinator and ChatsFlowCoordinator to ChatsTabFlowCoordinator.
* Add the basis for a state machine to UserSessionFlowCoordinator.
* Move the Settings flow from the Chats flow to UserSession flow.
It now works from the Spaces tab.
* Add a StateMachineFactory and use it to publish the state in the tests.