Mark wishlist items as purchased

If a wishlist is shared or if someone goes to another person’s wishlist and adds an item from that list to the cart and purchases it from there, allow the option for the item to be giftwrapped and/or shipped to the person who created the wishlist, and then mark that item as purchased on the list so that others who may go to that wishlist and buy something for that person can see what items have already been purchased so they can avoid purchasing duplicate gifts. This way a shop owner can use this plugin as a gift registry for weddings or other events.