Product Filters for WooCommerce 1.4.34

* Tweak - Bump WC requires at least to 6.0.
* Tweak - WC 8.6 compatibility.

* Fix - Improve accessibility for product filters.
* Fix - Release error.
* Tweak - Use "Filter" on buttons and messages instead of "Post".

* Dev - Fixes lint issues in the main plugin file.
* Fix - Register activation hook after plugins loaded.
* Tweak - Changed minimum WC version to 5.0.
* Tweak - WC 8.5 compatibility.

* Fix - Adds WooCommerce compatibility and versioning.

* Add - Versioning and compatibility checks to implement support policy.
* Fix - Improve accessibility for product filters.
* Fix - Revert "Adds WooCommerce compatibility and versioning".
* Tweak - Use "Filter" on buttons and messages instead of "Post".

Dev - Add phpcs on changed files only.

* Fix - Note items disappearing in second or more Notes widgets.
* Tweak - WC 8.2 compatibility.

* Add - Admin notice when WooCommerce isn't activated.
* Fix - Prevent fatal errors when WooCommerce is not activated.
* Tweak - WC 7.8 compatibility.

Missing pagination when accessing from a pre-filtered URL.

* Tweak - Handle deprecated warning for PHP 8.1.
* Tweak - WC 7.4 compatibility.