This folder holds locally-bundled copies of third party JS libraries the
plugin uses, so none of them are ever loaded from an external CDN.

qz-tray-2.2.4.js
  QZ Tray JavaScript SDK, used for silent thermal-printer printing.
  If QZ Tray is ever upgraded to a newer SDK version, replace this file
  with the matching version and update the filename reference in
  templates/pos.php (search for "qzLocalSdkUrl").

html5-qrcode.min.js
  Camera QR/barcode scanner library (v2.3.8), used by the Scan button
  on the product search bar and the SKU field. If upgraded, update the
  filename reference in templates/pos.php (search for "html5QrcodeUrl").

JsBarcode.all.min.js
  Barcode rendering on printed receipts.

qrcode.min.js
  QR code generation for the QR Engine feature.
