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/Common/DependencyInjection/Inject.swift

@@ -0,0 +1,46 @@
+// 
+// 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 Foundation
+
+/**
+ A property wrapped used to inject from the dependency
+ container on the instance to instance properties.
+ E.g. ```@Inject var someClass: SomeClass```
+ */
+@propertyWrapper struct Inject<Value> {
+    
+    static subscript<T: Injectable>(
+        _enclosingInstance instance: T,
+        wrapped wrappedKeyPath: ReferenceWritableKeyPath<T, Value>,
+        storage storageKeyPath: ReferenceWritableKeyPath<T, Self>
+    ) -> Value {
+        get {
+            // Resolve dependencies from enclosing instance's `dependencies` property
+            let v: Value = instance.dependencies.resolve()
+            return v
+        }
+        set {
+            fatalError("Only subscript get is supported for injection")
+        }
+    }
+    
+    @available(*, unavailable, message:  "This property wrapper can only be applied to classes")
+    var wrappedValue: Value {
+        get { fatalError("wrappedValue get not used") }
+        set { fatalError("wrappedValue set not used. \(newValue)" ) }
+    }
+}