WooCommerce Product Search 6.1.0

* WordPress 5.1 compatibility tested.
* WooCommerce compatibility tested.
* Fixes an issue introduced with WC 3.5.5 Fix: #22572-can't access settings ("The link you followed has expired") by outis · Pull Request #22573 · woocommerce/woocommerce where saving settings had no effect.

* Fixed an issue where a page containing blocks with filter shortcodes would show an error about failing to publish or update.
* Fixed wrong price filter limits when searching first and then applying price filters (a side-effect of incorrect parameter handling).
* Fixed an issue with the filter reset producing an invalid URL due to excessive escaping.
* Updated the price filter to use common price decimals and adjust the price range limits as floor and ceiling values.
* Added the woocommerce_product_search_filter_price_decimals filter that allows to modify the price filter decimals used.
* Added the woocommerce_product_search_service_min_max_price_adjust_decimals filter.
* Added the woocommerce_product_search_service_min_max_price_adjust_for_display_decimals filter.
* Improved performance and fixed results by removing redundant meta query related to price filter when our price filter is requested.

* Tested with the latest WooCommerce and WordPress, including the new WordPress 5 Blocks editor (Gutenberg).
* Revised and tested for compatibility with Gutenberg and other page builders.
* Fixed initial values of the price filter were not set appropriately when used in content (with page builder blocks and shortcodes).
* Improved price filtering so store prices without taxes and products displaying prices with taxes included are consistent.
* Removed deprecated auto adjust settings.
* Fixed missing lower bounds on price slider calculations resulting in NaN values.
* Fixed an issue when optimizing back end searches is disabled, the specialized product store would provide all products instead of matches only.