Woocommerce Amazon S3 Storage 3.0.4

* Feature - Enabled the S3 files wizard for the product variations.

* Tweak - Use the standard endpoint in all S3 regions when generating the file URLs.
* Tweak - Updated wizard fields' description.
* Fix - Fixed the URLs of the downloadable files stored in a bucket whose name contains dots.

* Feature - Added wizard to add and edit the S3 files of a downloadable product.
* Tweak - Declare compatibility with WooCommerce High-Performance Order Storage (HPOS).
* Tweak - Tested compatibility with WC 7.1.
* Tweak - Tested compatibility with WP 6.1.
* Dev - Dropped deprecated template 'settings.php'.