Fixed shutdown for core

samples/blackcore/main.cpp

@@ -24,5 +24,4 @@ int main(int argc, char *argv[])
 
     // loop
     return a.exec();
-
 }

samples/blackcore/tool.cpp

@@ -97,7 +97,7 @@ namespace BlackMiscTest
                 qDebug() << "voice rooms";
                 qDebug() << audioContext->getComVoiceRooms();
             }
-
         }
+        QCoreApplication::quit();
     }
 } // namespace