title: Create QIcon from resources.qrc file
body: <p>I have a <code>resources.qrc</code> file that looks like this:</p>
  
  <pre><code>&lt;RCC&gt;
    &lt;qresource prefix="/plugins/fw_einsatz"&gt;
      &lt;file&gt;base_aerial.png&lt;/file&gt;
      &lt;file&gt;base_alkis.png&lt;/file&gt;
      &lt;file&gt;adr.png&lt;/file&gt;
      &lt;file&gt;gps_coord.png&lt;/file&gt;
      &lt;file&gt;road.png&lt;/file&gt;
      &lt;file&gt;route.png&lt;/file&gt;
      &lt;file&gt;icon.png&lt;/file&gt;
    &lt;/qresource&gt;
  &lt;/RCC&gt;
  </code></pre>
  
  <p>I want to create a QIcon from these resources with</p>
  
  <pre><code>icon = QIcon('qrc:///route.png')
  </code></pre>
  
  <p>and then put it on a QPushButton with</p>
  
  <pre><code>self.pushButton_toggle_epl_view.setIcon(icon)
  </code></pre>
  
  <p>but no Icon is displayed. What am I missing? Wrong path?</p>