Some Post-demo Cleanups (#200)

* Remove redundant string

* Use placeholder avatar on home screen

* Add initial home screen ui test

* Fix settings screen PR remarks

* Remove UIKit alert from home screen sign out

* Remove UIKit alert from soft logout clear all data

* Add reference screenshots for home screen UI tests

* Formatting fixes

* Add clearing room method to client proxy

* Clear room proxies on screen dismiss

* Fix retain cycle in room view model

* Do not go into authentication state immediately

* Define sizes for user and room avatars on different screens

* Use defined avatar sizes everywhere

* Disable image disk caching

* Rename rounded corner shape

* Fix text color of placeholder avatars

* Fix PR reviews on formatted body text

* Fix merge conflict

* Remove shouldShowSenderDetails everywhere and just use it from inGroupState

* Remove redundant linter disablings

* Fix PR remarks

* Rename media provider size parameter

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

@@ -41,6 +41,9 @@ struct RoomScreen: View {
             }
         }
         .alert(item: $context.alertInfo) { $0.alert }
+        .onDisappear {
+            context.send(viewAction: .viewDisappeared)
+        }
     }
     
     private func sendMessage() {