Improvement: Added support for older browsers that don't use WEBP images.
Improvement: Recursing into subfolders while using the Manual Optimize Image section is now optional.
Improvement: Urls in srcsets are now being processed when using Automatic Optimize Image option and are also now being converted to WEBP images where necessary.
Improvement: When Lazyload image is enabled, hidden images are also only loaded when they become visible.
