Add timeline day separators and read markers (#383)

* Add timeline day separators and read markers

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

@@ -0,0 +1,39 @@
+//
+// 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 Foundation
+import SwiftUI
+
+struct ReadMarkerRoomTimelineView: View {
+    let timelineItem: ReadMarkerRoomTimelineItem
+    
+    var body: some View {
+        VStack {
+            Spacer(minLength: 4.0)
+            Divider()
+                .id(timelineItem.id)
+                .frame(maxWidth: .infinity)
+                .overlay(Color.element.accent)
+        }
+    }
+}
+
+struct ReadMarkerRoomTimelineView_Previews: PreviewProvider {
+    static var previews: some View {
+        let item = ReadMarkerRoomTimelineItem(id: UUID().uuidString)
+        ReadMarkerRoomTimelineView(timelineItem: item)
+    }
+}

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

@@ -25,7 +25,7 @@ struct SeparatorRoomTimelineView: View {
             .font(.element.footnote)
             .foregroundColor(.element.secondaryContent)
             .id(timelineItem.id)
-            .padding(.vertical, 8)
+            .padding(.vertical, 24)
             .frame(maxWidth: .infinity)
     }
 }