title: How to set QT_QPA_PLATFORM_PLUGIN_PATH properly (concept)?
body: <p>I have Qt Creator and Qt 5.5 installed.</p>
  
  <pre><code>QT_QPA_PLATFORM_PLUGIN_PATH = C:\Qt\5.5\msvc2013\plugins
  </code></pre>
  
  <p>If I disable the environment var, I do get an error when I launch an application from QtC. So the variable seems to be required.</p>
  
  <p>My problem is:</p>
  
  <ol>
  <li>When I run other Qt based applications (i.e. Teamspeak or such), those fail, I always have to disable (delete) <code>QT_QPA_PLATFORM_PLUGIN_PATH</code> first</li>
  <li>When I use KITS in QtC and switch between Qt versions (i.e. 5.4, 5.6) the variable is not in sync with this very version</li>
  </ol>
  
  <p>How is this supposed to work?</p>