RoomTimeline… refactor (drop the Room). (#3728)

* Add the timeline controller factory to the timeline view model.

In preparation for building a timeline to swipe through media in QuickLook.

* Refactor RoomTimelineControllerFactory.

* Refactor RoomTimelineController.

* Refactor RoomTimelineProvider.

ElementX/Sources/Screens/Timeline/View/Style/TimelineItemBubbledStylerView.swift

@@ -330,7 +330,7 @@ struct TimelineItemBubbledStylerView_Previews: PreviewProvider, TestablePreview
         let roomProxy = JoinedRoomProxyMock(.init(name: "Preview Room", pinnedEventIDs: ["pinned"]))
         return TimelineViewModel(roomProxy: roomProxy,
                                  focussedEventID: nil,
-                                 timelineController: MockRoomTimelineController(),
+                                 timelineController: MockTimelineController(),
                                  mediaProvider: MediaProviderMock(configuration: .init()),
                                  mediaPlayerProvider: MediaPlayerProviderMock(),
                                  voiceMessageMediaManager: VoiceMessageMediaManagerMock(),
@@ -338,7 +338,8 @@ struct TimelineItemBubbledStylerView_Previews: PreviewProvider, TestablePreview
                                  appMediator: AppMediatorMock.default,
                                  appSettings: ServiceLocator.shared.settings,
                                  analyticsService: ServiceLocator.shared.analytics,
-                                 emojiProvider: EmojiProvider(appSettings: ServiceLocator.shared.settings))
+                                 emojiProvider: EmojiProvider(appSettings: ServiceLocator.shared.settings),
+                                 timelineControllerFactory: TimelineControllerFactoryMock(.init()))
     }()
 
     static var previews: some View {