* Adjust login flow to exclusively use the ServerSelectionScreen
* Move async code to server selection vm
* ServerSelection supports pro picker options
* Use homeserver address for both confirmation and picker modes
* rename ServerSelectionScreenMode
* remove ServerConfirmationScreen
It's been superseded by the ServerSelectionScreen
* rename userInput
* Update strings with latest design strings
* Add server input autocompletion
* Store previous servers in AppSettings and autofill on server signin
* Audit changes for logging
* Enforce lowercase server history storage
* Update tests
* Update Xcode project
* PR review fixups
* Add HomeserverHistoryManager
* Review fixups 2
* Review fixups 3
Michael