[Feature Request] - Integrate LibRaw

I don't have the expertise to integrate libraw but I would very much like dlib to work with raw images. I've searched the documentation, past issues, and google and did not see any examples or past requests. I don't know the scope of what it would take to integrate libraw, so perhaps it's been tried or it's too much work. I just wanted to humbly suggest it as a feature. Also wanted to add a quick thank you to all the contributors. This is a wonderful project that's made my life a lot easier.