Converts any anchor tags with the class em-qr-code on a survey or data entry form into a QR Code.
<a href="https://www.mcri.edu.au/" target="_blank" class="em-qr-code">https://www.mcri.edu.au/</a>
If the anchor also has the class em-qr-code-this then the href attribute is overwritten with the current URL.
<a href="#" target="_blank" class="em-qr-code em-qr-code-this">This Page</a>