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/HomeScreen/HomeScreenModels.swift

@@ -52,7 +52,7 @@ struct HomeScreenViewState: BindableState {
     
     var rooms: [HomeScreenRoom] = []
     
-    var roomListMode: HomeScreenRoomListMode = .rooms
+    var roomListMode: HomeScreenRoomListMode = .skeletons
     
     var visibleRooms: [HomeScreenRoom] {
         if roomListMode == .skeletons {
@@ -77,6 +77,8 @@ struct HomeScreenViewState: BindableState {
 
 struct HomeScreenViewStateBindings {
     var searchQuery = ""
+    
+    var alertInfo: AlertInfo<UUID>?
 }
 
 struct HomeScreenRoom: Identifiable, Equatable {
@@ -92,15 +94,12 @@ struct HomeScreenRoom: Identifiable, Equatable {
     
     var avatar: UIImage?
     
-    var isPlaceholder = false
-    
     static func placeholder(id: String) -> HomeScreenRoom {
         HomeScreenRoom(id: id,
                        name: "Placeholder room name",
                        hasUnreads: false,
                        timestamp: "Now",
                        lastMessage: AttributedString("Last message"),
-                       avatar: UIImage(systemName: "photo"),
-                       isPlaceholder: true)
+                       avatar: UIImage(systemName: "photo"))
     }
 }