Make QToolTip display a QImage

Allow the Developer to display an image using a QToolTip.
E.g. QToolTip::showImage()

Various Tutorials using rich text + embedded HTML images exist but they are far too complex:

1.) Save a PNG image to QByteArray.
2.) Convert the QByteArray to BASE64.
3.) Create the HTML embedded image using <img ...>.
4.) QToolTip::showText().