Reading use_root_path also from global config
Increment version to v1.0.21: Support domain sharding for https in res.cloudinary.com, support url_suffix and use_root_path for private_cdn URL building, fix potential XSS vulnerability on cloudinary_cors.html, upgrade to jquery.fileupload.js version 5.42.1, Traverse ancestors in DOM to find clientWidth for responsive images, fix dpr cache.