title: Extend Camera Remote API for adjusting the focus
body: <p>Could you please extend the Camera Remote API with some function to set and get the focus. This could be used for macro or landscape photography to allow taking pictures for focus stacking.
  It would be great to have 4 additional calls to be able to implement taking pictures for focus stacking (e.g. for the Sony a7m3).</p>
  
  <ul>
  <li>setFocusPoint(xPosition, yPosition): Where x and y is the position corresponding to the the display of the camera</li>
  <li><p>getFocusPoint(): Get x and y</p></li>
  <li><p>setFocusDistance(distance): Where distance is specified in meter (float).</p></li>
  <li>getFocusDistance()</li>
  </ul>
  
  <p>This way you could define a start and end point and how many pictures you want do end up, then calculate the steps in between to get several focus plains you can stack in post processing.</p>