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/Services/Timeline/RoomTimelineController.swift

@@ -149,7 +149,6 @@ class RoomTimelineController: RoomTimelineControllerProtocol {
                 guard eventItem.isMessage || eventItem.isRedacted else { break } // To be handled in the future
 
                 newTimelineItems.append(await timelineItemFactory.buildTimelineItemFor(eventItemProxy: eventItem,
-                                                                                       showSenderDetails: inGroupState.shouldShowSenderDetails,
                                                                                        inGroupState: inGroupState))
             case .virtual:
 //            case .virtual(let virtualItem):
@@ -252,7 +251,7 @@ class RoomTimelineController: RoomTimelineControllerProtocol {
                 return
             }
             
-            switch await mediaProvider.loadImageFromURLString(avatarURLString, size: MediaProviderDefaultAvatarSize) {
+            switch await mediaProvider.loadImageFromURLString(avatarURLString, avatarSize: .user(on: .timeline)) {
             case .success(let avatar):
                 guard let index = timelineItems.firstIndex(where: { $0.id == timelineItem.id }),
                       var item = timelineItems[index] as? EventBasedTimelineItemProtocol else {