Click tag mentions

You can now click on a username in the main chat to add a "@username"
tag to the chat. Makes communication with other users using tags faster.

cockatrice/src/tab_room.h

@@ -56,6 +56,7 @@ private slots:
     void actIgnoreUnregisteredUsers();
     void actClearChat();
     void ignoreUnregisteredUsersChanged();
+    void addMentionTag(QString mentionTag);
     
     void processListGamesEvent(const Event_ListGames &event);
     void processJoinRoomEvent(const Event_JoinRoom &event);