Rename "barcode" module to "barcodes" to prevent import shadowing

- Add 'barcode' support

InvenTree/templates/qr_code.html

@@ -4,7 +4,7 @@
 <div class='container' style='width: 80%;'>
     {% if qr_data %}
     <div class='qr-container'>
-        <img src="{% qr_code qr_data %}">
+        <img src="{% qrcode qr_data %}">
     </div>
     {% else %}
     <div class='alert alert-block alert-warning'>