SwiftUI NavigationController and UserNotificationControllers (#309)

* Fixes #286 - Adopted the new SwiftUI NavigationStack based NavigationController throughout the application
* Fixes #315 - Implemented new user notification components on top of SwiftUI and the new navigation flows
* Add home screen fade animation between skeletons and real rooms
* Bump the danger-swift version used on the CI and swiftlint with it
* Renamed Splash to Onboarding, Empty to Splash

ElementX/Sources/Screens/OnboardingScreen/OnboardingViewModel.swift

@@ -0,0 +1,45 @@
+//
+// 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 Combine
+import SwiftUI
+
+typealias OnboardingViewModelType = StateStoreViewModel<OnboardingViewState, OnboardingViewAction>
+
+class OnboardingViewModel: OnboardingViewModelType, OnboardingViewModelProtocol {
+    // MARK: - Properties
+
+    // MARK: Private
+
+    // MARK: Public
+
+    var callback: ((OnboardingViewModelAction) -> Void)?
+
+    // MARK: - Setup
+
+    init() {
+        super.init(initialViewState: OnboardingViewState())
+    }
+
+    // MARK: - Public
+
+    override func process(viewAction: OnboardingViewAction) async {
+        switch viewAction {
+        case .login:
+            callback?(.login)
+        }
+    }
+}