WPMU DEV - Hummingbird 3.7.2

- Fix: Remove background color from critical.css file
- Enhance: Change default value for file change detection
- Fix: register_rest_route was called incorrectly warning in WordPress 5.5
- Fix: Asset Optimization not enabling in network admin in WordPress 5.5
- Fix: Performance modal closing on initial scan

Enhance: WordPress 5.5 compatibility
Fix: Performance scans getting stuck on a loop
Fix: Settings reset functionality

New: Redis object cache
New: Comment lazy loading
Enhance: Performance report functionality
Enhance: Try to fetch latest performance report, if present on the Hub
Enhance: Compatibility with Oxygen builder
Enhance: Asset Optimization UI
Enhance: Performance reporting UI
Enhance: Uptime reporting UI
Enhance: Page cache handling of advanced-cache.php file
Fix: Asset Optimization not returning some assets back to WordPress queue
Fix: Asset Optimization not updating assets on version change
Fix: Cache clear from Hub
Fix: Deactivate button in Gzip module
Fix: Smush links in dashboard meta box
Fix: class-oembed.php is deprecated error