WooCommerce Catalog Visibility Options 3.3.6

* 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

* New: Add location filters to individual products for who can purchase and who can view prices.
* New: Add role and location filters to categories for who can purchase and who can view prices.
* New: Update location filters to be inclusive or exclusive on individual products.
* Update: Update API in prep for the Product Data Tables move in WC core.
* Update: Allow adding to the cart even if prices are disabled.
* Fix: Fix issue where "What locations can view this product" were not compatible with newer versions of WooCommerce.