Use thread protocols where possible

Riot/Modules/Room/DataSources/RoomDataSource.h

@@ -130,6 +130,6 @@
  @param roomDataSource room data source instance
  */
 - (void)roomDataSource:(RoomDataSource * _Nonnull)roomDataSource
-          didTapThread:(MXThread * _Nonnull)thread;
+          didTapThread:(id<MXThreadProtocol> _Nonnull)thread;
 
 @end

Riot/Modules/Room/DataSources/RoomDataSource.m

@@ -466,7 +466,8 @@ const CGFloat kTypingCellHeight = 24;
                     //  display thread summary view if the component has a thread in the room timeline
                     if (RiotSettings.shared.enableThreads && component.thread && !self.threadId)
                     {
-                        threadSummaryView = [[ThreadSummaryView alloc] initWithThread:component.thread];
+                        threadSummaryView = [[ThreadSummaryView alloc] initWithThread:component.thread
+                                                                              session:self.mxSession];
                         threadSummaryView.delegate = self;
                         threadSummaryView.tag = index;