[rust-dev] Deprecating rustpkg

Hey again, Rusticians. So I think most of us know that rustpkg isn't quite working the way people expect, and the general consensus seems to be that its flaws extend pretty deep, to the point where it may just not be exposing the right model. I'd like to deprecate it immediately to end the frustrations people continue encountering with it, while we figure out what to do with it. Having a good packaging story is critical for Rust's adoption, so I want to keep pushing on this. I am looking into hiring a domain expert to help us. Regards, Brian