Added message historyp

src/app.h

@@ -116,6 +116,7 @@ private:
     void createMenu();
     void addLeaveButton();
     void logout();
+    void addHistoryButton();
     void addIdentifier();
     void addSearchButton();
     void addInboxButton();
@@ -194,6 +195,8 @@ private:
     std::string genderShortOfGender(const std::string incomingGender);
     void extendSearchResultIfNeeded(Wt::Json::Object broadcast);
     void removeUserFromSearch(Wt::Json::Object broadcast);
+    void requestHistory();
+    void showHistory(Wt::Json::Object broadcast);
 };
 
 #endif // APP_H