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/Other/ElementNavigationController.swift

@@ -0,0 +1,18 @@
+//
+//  ElementNavigationController.swift
+//  ElementX
+//
+//  Created by Ismail on 20.06.2022.
+//  Copyright © 2022 Element. All rights reserved.
+//
+
+import UIKit
+
+class ElementNavigationController: UINavigationController {
+
+    override func viewWillLayoutSubviews() {
+        super.viewWillLayoutSubviews()
+        navigationBar.topItem?.backButtonDisplayMode = .minimal
+    }
+
+}

ElementX/Sources/Other/Routers/NavigationRouterStore.swift

@@ -44,7 +44,7 @@ class NavigationRouterStore: NavigationRouterStoreProtocol {
             return existingNavigationRouter
         }
         
-        let navigationRouter = NavigationRouter(navigationController: UINavigationController())
+        let navigationRouter = NavigationRouter(navigationController: ElementNavigationController())
         return navigationRouter
     }