title: Deprecated methods in wxBitmap?
body: <p>When using wxWidgets 3.1 I get the following deprecation warnings with wxBitmap:</p>
  
  <pre><code>'wxGDIImage::SetWidth': was declared deprecated
  'wxGDIImage::SetHeight': was declared deprecated
  </code></pre>
  
  <p>As I can't find a suitable hint at the related position in sourcecode: what is the replacement for this? How shall one set width and height of a bitmap now?</p>