Mention popup fix

+ will now only popup with a mention alert when you are not on the same
tab/window.
+ will also no longer popup by mentioning yourself

cockatrice/src/chatview.h

@@ -65,6 +65,7 @@ signals:
     void deleteCardInfoPopup(QString cardName);
     void addMentionTag(QString mentionTag);
     void messageClickedSignal();
+    void showMentionPopup(QString &sender);
 };
 
 #endif