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.xcodeproj/project.xcworkspace/xcshareddata/swiftpm/Package.resolved

@@ -111,7 +111,7 @@
     {
       "identity" : "swift-snapshot-testing",
       "kind" : "remoteSourceControl",
-      "location" : "https://github.com/pointfreeco/swift-snapshot-testing",
+      "location" : "https://github.com/pointfreeco/swift-snapshot-testing.git",
       "state" : {
         "revision" : "f29e2014f6230cf7d5138fc899da51c7f513d467",
         "version" : "1.10.0"
@@ -129,7 +129,7 @@
     {
       "identity" : "swiftui-introspect",
       "kind" : "remoteSourceControl",
-      "location" : "https://github.com/siteline/SwiftUI-Introspect",
+      "location" : "https://github.com/siteline/SwiftUI-Introspect.git",
       "state" : {
         "revision" : "f2616860a41f9d9932da412a8978fec79c06fe24",
         "version" : "0.1.4"