Room screen header (#86)

* #35 Create `ElementNavigationController` subclass

* #35 Add encryption icons

* #35 Add avatar and encryption badge image to the room screen view model

* #35 Create `RoomHeaderView` class

* #35 Replace room title with a RoomHeaderView instance in the toolbar

* #35 Add changelog

* #35 Introduce `UITestScreenIdentifier` and refactor ui tests

* #35 Fix old tests

* #35 add some tests for room screen

* #35 Use svgs instead of pngs

* #35 Fix PR remarks

ElementX/Sources/Screens/RoomScreen/View/RoomScreen.swift

@@ -28,8 +28,12 @@ struct RoomScreen: View {
             }
             .padding()
         }
-        .navigationTitle(context.viewState.roomTitle)
         .navigationBarTitleDisplayMode(.inline)
+        .toolbar {
+            ToolbarItem(placement: .navigationBarLeading) {
+                RoomHeaderView(context: context)
+            }
+        }
     }
     
     private func sendMessage() {