WooCommerce Catalog Visibility Options 3.3.4

* Update: Include template for variation data for when purchases disabled but prices enabled.
* Update: WC and WP version updates.

* Update: Check for output buffer before filtering.
* Update: Check rendered content in after cart button, fixes issues with themes which call woocommerce_after_add_to_cart_button inside of their own variable.php
* Update: Clean up alternate variation HTML to remove duplicate divs

* Update: Modify the category filters so that the store default is taken into account.
The individual category rules will override the store defaults in a sensible way.
* Update: WC tested to 3.5