Improve the status of send messages (sending, sent, received, failed)

- update after review

Riot/Modules/Room/CellData/RoomBubbleCellData.h

@@ -87,6 +87,11 @@ typedef NS_ENUM(NSInteger, RoomBubbleCellDataTag)
  */
 @property(nonatomic) BOOL isKeyVerificationOperationPending;
 
+/**
+ Index of the component which needs a sent tick displayed. -1 if none.
+ */
+@property(nonatomic) NSInteger componentIndexOfSentMessageTick;
+
 /**
  Indicate to update additional content height.
  */