W3 Total Cache Pro 2.8.0

* Fix: Cloudflare: Removed use of the retired ip_lkup V1 endpoint
* Fix: Prevent error in some environments using non-direct filesystems
* Fix: Added better checking for some filesystem actions
* Fix: AWS CloudFront: Reverted async change for cache invalidation to honor promises
* Enhancement: Added option to exclude minified JS files from being processed by Rocket Loader
* Enhancement: Improved handling of Image Service rate-limiting and error messages

Feature: Image Service API extension: WebP conversion options

Fix: Cloudflare Dashboard Widget: Updated to use GraphQL
Fix: Cloudflare Dashboard Widget: Use WordPress timezone
Fix: CDN: Execute purge only if hosting is enabled, to prevent unneeded delays
Fix: Published/modified custom posts not clearing the archive cache(s)
Fix: Native WordPress sitemap caching
Fix: Extra MIME groups other than controlled by settings were added to rules
Fix: Usage Statistics: Not functioning when object cache is set to Redis
Fix: AMP Extension: Prevent popup admin bar for endpoints
Fix: Setup Guide Wizard: CSS for long translations
Fix: Opcache Settings: Validate timestamp indicator checkbox
Update: Remove robots.txt cache toggle setting
Enhancement: Impove 404 detection
Enhancement: Improved compatibility check indicators
Enhancement: AWS CloudFront: Faster cache invalidation using async