Allow off-site links for wishlists

It would be nice to add off-site products to a wishlist. Jinxxys wishlist system has a lot of potential and other sites like gumroad are lacking; eg. inability to have a priority, ect (see my other sugget here https://jinxxy.canny.io/feature-requests/p/ability-to-wishlist-products-on-their-sale-page)

Then we can have one wishlist for all the different platforms; booth, gumroad, ect, without having to go to these other sites to deal with their systems. This can be good too for noting down what sites have the best price (usually it's jinxxy anyways.)