Further design updates to the timeline. (#524)

- Decryption banner on the timeline
- Bubble colours
- Background insets
- Multiline composer corner radius
- Read marker
- GIF indicator
- Reactions shape
- Use RoomTimelineViewLabelStyle everywhere possible
- Only set a line limit on reply quotes, allow all the lines for regular quotes.
- Message label icons
- Yes/No button casing
- Make sender profiles immutable.
- Enable copy link and invite buttons.
- Fix layout loop detecting multiline composer text.
- Add animation to the encryption banner.

ElementX/Sources/Services/Timeline/TimelineController/RoomTimelineControllerProtocol.swift

@@ -23,6 +23,7 @@ enum RoomTimelineControllerCallback {
     case updatedTimelineItem(_ itemId: String)
     case canBackPaginate(Bool)
     case isBackPaginating(Bool)
+    case hasEncryptedItems(Bool)
 }
 
 enum RoomTimelineControllerAction {