Added room timeline screen with live events listening and back pagination. Rearranged project files.

ElementX/Sources/Services/Timeline/MockRoomTimelineController.swift

@@ -0,0 +1,20 @@
+//
+//  MockRoomTimelineController.swift
+//  ElementX
+//
+//  Created by Stefan Ceriu on 04.03.2022.
+//  Copyright © 2022 Element. All rights reserved.
+//
+
+import Foundation
+import Combine
+
+class MockRoomTimelineController: RoomTimelineControllerProtocol {
+    let timelineItems: [RoomTimelineItemProtocol] = [TextRoomTimelineItem(id: UUID().uuidString, senderDisplayName: "Anne", text: "You rock!", originServerTs: .now),
+                                                     TextRoomTimelineItem(id: UUID().uuidString, senderDisplayName: "Bob", text: "You rule!", originServerTs: .now)]
+    let callbacks = PassthroughSubject<RoomTimelineControllerCallback, Never>()
+    
+    func paginateBackwards(_ count: UInt) {
+        
+    }
+}