WP Smush Pro 3.18

- Fix: PHP warnings
- Improvement: Compatibility with WP 6.6

- Fix: Loopback error shown unnecessarily for some sites
- Improvement: Better UI for the loopback error

- Improvement: Better handling of rotated images
- Improvement: Better pre-flight checks before bulk Smush is started
- Fix: Performance issues in CDN and webp link replacement functionality
- Fix: Bulk Smush performance issues
- Fix: Compatibility issue with wp.com