WooCommerce Dynamic Pricing 3.3.0

* Update: Check for null cart items in sorting function. Should never happen unless a plugin or theme is incorrectly loading the cart.
* Update: Tested to WC 3.5

* New: Included a new collector module to allow inclusive ( AND ) for advanced category rules. Since this is a unusual use case a filter is needed to enable.
-- add_filter('wc_dynamic_pricing_get_collector_object', function($collector, $type) { return 'WC_Dynamic_Pricing_Collector_Category_Inclusive'; }, 10, 2);
* Fix: Include check that categories have been selected before attempting count.

* Update: Added an argument to the quantity collector filter, which now passes in the rule set.
* Update: Properly sort cart items for discounting in ascending order.
* Update: Use multiselect fields instead of checkboxes in Advanced Category Rules.
* Update: Use multiselect fields instead of checkboxes in Advanced Product Rules.
* Update: Use multiselect fields instead of checkboxes in Order Total Pricing.
* Update: Use variation names instead of variation ID's only in Advanced Product Rules.
* Fix: Fix issue with the woocommerce_dynamic_pricing_count_categories_for_cart_item filter where the wrong cart item was being passed.