Tiered Pricing Table for WooCommerce 7.2.0

* New: New global pricing rules form
* New: Maximum and "group of quantity" quantity options
* New: Percentage discounts for regular prices for role-based pricing rules
* New: Gutenberg blocks for tiered pricing
* New: Base unit name per product
* New: Custom columns for pricing table
* New: "You save" feature
* New: Notice when tiered pricing is set incorrectly
* New: Debug mode
* New: Minimum PHP version is 7.2
* New: Yith request a quote integration
* New: Calculation logic settings
* Update: Codebase redesign
* Update: Settings page updated
* Update: Redesigned tiered pricing for manual orders
* Update: Cache and performance updates
* Fix: a bunch of minor issues

* Fix: fatal error with cart upsell on the cart

* New: New integration section
* New: WPML multicurrency integration
* Update: update copy-once to copy for tiered pricing fields in wpml.config
* Fix: PHP 8.1+ notices
* Fix: Product add-ons integration. Case when taxes are enabled.
* Fix: Do not remove item from cart when quantity is below the minimum. Update the quantity instead.