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

@@ -0,0 +1,48 @@
+//
+// Copyright 2022 New Vector Ltd
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+
+import SwiftUI
+
+struct RoundedCornerShape: Shape {
+    let radius: CGFloat
+    let corners: UIRectCorner
+
+    init(radius: CGFloat, corners: UIRectCorner) {
+        self.radius = radius
+        self.corners = corners
+    }
+
+    init(radius: CGFloat, inGroupState: TimelineItemInGroupState) {
+        self.init(radius: radius, corners: inGroupState.roundedCorners)
+    }
+
+    func path(in rect: CGRect) -> Path {
+        let path = UIBezierPath(roundedRect: rect,
+                                byRoundingCorners: corners,
+                                cornerRadii: CGSize(width: radius, height: radius))
+        return Path(path.cgPath)
+    }
+}
+
+extension View {
+    func cornerRadius(_ radius: CGFloat, corners: UIRectCorner) -> some View {
+        clipShape(RoundedCornerShape(radius: radius, corners: corners))
+    }
+
+    func cornerRadius(_ radius: CGFloat, inGroupState: TimelineItemInGroupState) -> some View {
+        clipShape(RoundedCornerShape(radius: radius, inGroupState: inGroupState))
+    }
+}