W3 Total Cache Pro 2.8.8

* Fix: Usage Statistics JavaScript error
* Fix: Regex matching for Cookie Cache Groups
* Fix: Image Service: Error when get_current_screen() is run before admin_init
* Fix: _load_textdomain_just_in_time timing issue for WP-CLI and the Setup Guide
* Fix: "DOMDocument::loadHTML(): ID already defined in Entity" errors
* Fix: Cloudflare: Saving settings with a value of 0
* Update: Removed StackPath, Limelight, and Highwinds CDNs due to end of service

* Fix: Exit survey email field submission
* Fix: Setup Guide analytics
* Update: Allow deleting plugin data when skipping the exit survey on deactivation
* Update: aws/aws-php-sns-message-validator (1.9.0 => 1.9.1)

* Fix: Error deactivating when selected to delete plugin data
* Fix: WP-CLI: Enable Object Cache depending on settings
* Fix: Delete all plugin WordPress Options if selected on deactivation
* Enhancement: Automatically disable Object Cache after plugin update if set to Disk and display a notice
* Enhancement: WP-CLI: Added settings to enable Object and DB Cache for WP-CLI
* Enhancement: Added an email field to the exit survey for requesting help
* Enhancement: Added a popup modal to accept the risk when enabling Object Cache using Disk