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

.github/workflows/danger.yml

@@ -16,6 +16,6 @@ jobs:
           key: danger-swift-cache-key
 
       - name: Danger
-        uses: docker://ghcr.io/danger/danger-swift-with-swiftlint:3.12.3
+        uses: docker://ghcr.io/danger/danger-swift-with-swiftlint:3.14.2
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}