Port all system UI notifications to use the registry. Retain stable integer IDs where they exist. Assign new stable IDs where resource IDs were previously used. Using "message" rather than "notification" since we may eventually want to include dialogs and toasts. Bug: 32584866 Bug: 30995038 Test: runtest systemui Change-Id: Iec4d7cebbd88683e339ada29a279315222699942