title: Woocommerce: add functionality to close "add to cart" success message popup
body: <p>This is my first post, so please be gentle. I'm finishing up a Woocommerce-based site, and my clients have requested that there be the ability to close (e.g. with a little "x" button) the little popup banner for the "successfully added to cart" message that appears on product pages. (Currently there only exists the option to "view cart" via that popup.) This does not appear to be a built-in setting for this in WooCommerce.</p>
  
  <p>To see what I'm talking about, you can go to <a href="https://www.drinkreorient.com/product/rose-root/" rel="nofollow noreferrer">https://www.drinkreorient.com/product/rose-root/</a> and add this product to the cart (no purchase necessary ;-)). You should then see the popup.</p>
  
  <p>I've made a few attempts at it via googling around and fiddling with functions.php and the "wc_add_to_cart_message" function, but no success. I'm not terribly fluent in the php (or javascript) necessary to make this happen. Thanks in advance!</p>