WooCommerce Twilio SMS Notifications 1.19.4

* Misc - Updated the SkyVerge Plugin Framework to v6.2.2

* Fix - Compatibility error when certain other SkyVerge plugins are activated

* Fix - "Translations loaded too early" error
* Misc - Tested up to WooCommerce 10.2
* Misc - Improve escaping and sanitizing in codebase

* Fix - Fatal error when using Twilio with the Bookings plugin

* Misc - Upgrade to SkyVerge plugin framework version 5.12.2
* Feature - Add support for the WooCommerce Checkout Block
* Dev - The meta key name for SMS opt-in has been changed from `_wc_twilio_sms_optin` to `_wc_other/skyverge/twilio-opt-in`. We've added backwards compatibility, but if you reference this key name in custom code please be sure to update your references accordingly.
* Fix - "Send SMS" from admin order page not working with HPOS

* Misc - Add admin notice to help merchants reverting to the checkout shortcode if the checkout block is used

* Misc - Require PHP 7.4 and WordPress 5.6

* Fix - Replace deprecated `is_ajax()` usages with `wp_doing_ajax()`
* Misc - Require WooCommerce 3.9.4 or newer

* Dev - Add booking and order parameters to `wc_twilio_sms_bookings_token_map` filter hook

* Misc - Add compatibility for WooCommerce 4.7
* Misc - Require PHP 7.0 or newer