Some reader improvements

* Log when VATSIM status file has been read
* fix: read VATSIM status file after initReaders completes
* some private slots -> normal private functions
* removed copy/paste error illegalIcaoCodes

follow up of Ref T105

src/blackcore/application.cpp

@@ -721,13 +721,13 @@ namespace BlackCore
             this->m_webDataServices.reset(
                 new CWebDataServices(this->m_webReadersUsed, this->m_dbReaderConfig, {}, this)
             );
+            emit webDataServicesStarted(true);
         }
         else
         {
             msgs.push_back(CStatusMessage(this).info("Web data services already running"));
         }
 
-        emit webDataServicesStarted(true);
         return msgs;
     }