Finish extraction

- Moves SwiftUI code out of Riot and into RiotSwiftUI which has no dependency on Matrix SDK.
- Git wasn't smart enough to see the file moves. Most feature function has remain unchanged. 1 change I did make was remove NotificationSettingsViewModel's dependence on MxPushRule, so that the view model could be moved into RiotSwiftUI.
- Add LocaleProvider to abstract VectorL10n's use of Matrix SDK language so it can be used in RiotSwiftUI.
- Split Theme into UKit/SwiftUI version to remove RiotSwiftUI's dependence on ThemeService and ThemeV1.
- Migrated from ThemeObserver to ThemePublisher. We push updates to ThemePublisher so that we can remove ThemeService as dependency.
- Add .DS_Store to .gitignore

RiotSwiftUI/Modules/Room/NotificationSettings/View/RoomNotificationSettings.swift

@@ -0,0 +1,98 @@
+//
+// Copyright 2021 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 SwiftUI
+
+@available(iOS 14.0.0, *)
+struct RoomNotificationSettings: View {
+    
+    @ObservedObject var viewModel: RoomNotificationSettingsSwiftUIViewModel
+    
+    let presentedModally: Bool
+    
+    @ViewBuilder
+    private var leftButton: some View {
+        if presentedModally {
+            Button(VectorL10n.cancel) {
+                viewModel.process(viewAction: .cancel)
+            }
+        }
+    }
+    
+    @ViewBuilder
+    private var rightButton: some View {
+        Button(VectorL10n.save) {
+            viewModel.process(viewAction: .save)
+        }
+    }
+    
+    var body: some View {
+        VectorForm {
+            if  let avatarData = viewModel.viewState.avatarData as? AvatarInputType {
+                RoomNotificationSettingsHeader(
+                    avatarData: avatarData,
+                    displayName: viewModel.viewState.displayName
+                )
+            }
+            SwiftUI.Section(
+                header: FormSectionHeader(text: VectorL10n.roomNotifsSettingsNotifyMeFor),
+                footer: FormSectionFooter(text: viewModel.viewState.roomEncryptedString)
+            ) {
+                ForEach(viewModel.viewState.notificationOptions) { option in
+                    FormPickerItem(title: option.title, selected: viewModel.viewState.notificationState == option) {
+                        viewModel.process(viewAction: .selectNotificationState(option))
+                    }
+                }
+            }
+        }
+        .activityIndicator(show: viewModel.viewState.saving)
+        .navigationBarTitle(VectorL10n.roomDetailsNotifs)
+        .navigationBarItems(
+            leading: leftButton,
+            trailing: rightButton
+        )
+        .onAppear {
+            viewModel.process(viewAction: .load)
+        }
+    }
+}
+
+@available(iOS 14.0, *)
+struct RoomNotificationSettings_Previews: PreviewProvider {
+    
+    static let mockViewModel = RoomNotificationSettingsSwiftUIViewModel(
+        roomNotificationService: MockRoomNotificationSettingsService.example,
+        avatarData: MockAvatarInput.example,
+        displayName: MockAvatarInput.example.displayName,
+        roomEncrypted: true
+    )
+    
+    static var previews: some View {
+        Group {
+            NavigationView {
+                RoomNotificationSettings(viewModel: mockViewModel, presentedModally: true)
+                    .navigationBarTitleDisplayMode(.inline)
+                    .addDependency(MockAvatarService.example)
+            }
+            NavigationView {
+                RoomNotificationSettings(viewModel: mockViewModel, presentedModally: true)
+                    .navigationBarTitleDisplayMode(.inline)
+                    .theme(ThemeIdentifier.dark)
+                    .addDependency(MockAvatarService.example)
+            }
+        }
+    }
+}