title: Why RangeSlider is available in QtQuick and not as standard Widget
body: <p>I need something like a range slider (a slider that has two handles for setting min/max values).</p>
  
  <p>I noticed that there is a <code>RangeSlider</code> in QtQuick and QML (Whatever that is), but there is not a 'standard widget' such as <code>QRangeSlider</code>. </p>
  
  <p>Why is this?</p>
  
  <p>Can I use that <code>RangeSlider</code> from QtQuick without writing QML code?</p>