Whether you're an experienced baker trying to get out of your all-purpose rut or a rookie wondering if those specialty flours are just a marketing gimmick, you've no doubt seen the plethora of different types of flours in the grocery store or in recipes you'd like to try. But now that we're trying to make as few trips as possible to the grocery store and all-purpose flour is often out-of-stock, what's the deal with all the other types of flour in the baking aisle? Well, if a recipe was…