title: How to log unicode character string with Poco::Logger?
body: <p>I'm using <a href="https://pocoproject.org/" rel="nofollow noreferrer">POCO</a> C++ libraries version <strong>1.7.5</strong> for loading a few records from database and logging them in file with POCO logger utility. One of the string records is in unicode format which I saved in <code>std::wstring</code>. I can not find how to log <code>std::wstring</code> with POCO logger.</p>
  
  <pre><code>Poco::Logger logger;
  std::wstring gameName;
  ...
  logger.information("GameName: %s", gameName.c_str());
  </code></pre>
  
  <p>The result is:</p>
  
  <pre><code>2017-04-27 11:47:28.438 - GameName: [ERRFMT]
  </code></pre>
  
  <p>How to log <code>std::wstring</code> properly?</p>