Use new, more evocative MessageManager API

At various places where semantics doesn't change.

Change-Id: Ib4d4a5c9f067e109126c6de88257f9e198a71447
Reviewed-by: hjk <hjk@qt.io>

src/plugins/cppcheck/cppcheckrunner.cpp

@@ -206,7 +206,7 @@ void CppcheckRunner::handleFinished(int)
         m_tool.finishParsing();
     } else {
         const QString message = tr("Cppcheck failed to start: \"%1\".").arg(currentCommand());
-        Core::MessageManager::write(message, Core::MessageManager::Silent);
+        Core::MessageManager::writeSilently(message);
     }
     m_currentFiles.clear();
     m_process->close();