Request: Custom protocol callbacks

[Erorus-11776]

Please allow mobile deep link redirect urls

Currently the redirect_url must have an http or https prefix. This means that in order to use the Blizzard API you must have some sort of apache redirect kung-fu to make it back to your app and breaks most oauth libraries meaning you also have to use webviews and store the tokens yourself. Most other oauth providers allow for any redirect urls so it’s not exactly clear what the concern is in this scenario. Would love to hear it. Thanks!