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/Other/SwiftUI/Views/RoundedCornerShape.swift

@@ -16,7 +16,7 @@
 
 import SwiftUI
 
-struct RoundedCorner: Shape {
+struct RoundedCornerShape: Shape {
     let radius: CGFloat
     let corners: UIRectCorner
 
@@ -39,10 +39,10 @@ struct RoundedCorner: Shape {
 
 extension View {
     func cornerRadius(_ radius: CGFloat, corners: UIRectCorner) -> some View {
-        clipShape(RoundedCorner(radius: radius, corners: corners))
+        clipShape(RoundedCornerShape(radius: radius, corners: corners))
     }
 
     func cornerRadius(_ radius: CGFloat, inGroupState: TimelineItemInGroupState) -> some View {
-        clipShape(RoundedCorner(radius: radius, inGroupState: inGroupState))
+        clipShape(RoundedCornerShape(radius: radius, inGroupState: inGroupState))
     }
 }