Renaming screens returns (#829)

* Rename: StartChat -> StartChatScreen

* Rename: Login -> LoginScreen

* Rename: ServerSelection -> ServerSelectionScreen

* Rename: SoftLogout -> SoftLogoutScreen

ElementX/Sources/Screens/StartChatScreen/StartChatScreenModels.swift

@@ -0,0 +1,55 @@
+//
+// Copyright 2022 New Vector Ltd
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+
+import Foundation
+
+enum StartChatScreenErrorType: Error {
+    case failedCreatingRoom
+    case unknown
+}
+
+enum StartChatScreenViewModelAction {
+    case close
+    case createRoom
+    case openRoom(withIdentifier: String)
+}
+
+struct StartChatScreenViewState: BindableState {
+    var bindings = StartChatScreenViewStateBindings()
+    var usersSection: UserDiscoverySection = .init(type: .suggestions, users: [])
+
+    var isSearching: Bool {
+        !bindings.searchQuery.isEmpty
+    }
+    
+    var hasEmptySearchResults: Bool {
+        isSearching && usersSection.type == .searchResult && usersSection.users.isEmpty
+    }
+}
+
+struct StartChatScreenViewStateBindings {
+    var searchQuery = ""
+    
+    /// Information describing the currently displayed alert.
+    var alertInfo: AlertInfo<StartChatScreenErrorType>?
+}
+
+enum StartChatScreenViewAction {
+    case close
+    case createRoom
+    case inviteFriends
+    case selectUser(UserProfile)
+}