The pipes compiler produced data types that encoded efficient and safe bounded message passing protocols between two endpoints. It was also capable of producing unbounded protocols. It was useful research but was arguably done before its proper time. I am removing it for the following reasons: * In practice we used it only for producing the `oneshot` protcol and the unbounded `stream` protocol and all communication in Rust use those. * The interface between the proto! macro and the standard library has a large surface area and was difficult to maintain through language and library changes. * It is now written in an old dialect of Rust and generates code which would likely be considered non-idiomatic. * Both the compiler and the runtime are difficult to understand, and likewise the relationship between the generated code and the library is hard to understand. Debugging is difficult. * The new scheduler implements `stream` and `oneshot` by hand in a way that will be significantly easier to maintain. This shouldn't be taken as an indication that 'channel protocols' for Rust are not worth pursuing again in the future. Concerned parties may include: @graydon, @pcwalton, @eholk, @bblum The most likely candidates for closing are #7666, #3018, #3020, #7021, #7667, #7303, #3658, #3295.

Port pipes compiler to newsched #7666

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