glycerine/greenpack

Cross-language serialization for Golang: greenpack adds versioning, stronger typing, and optional schema atop msgpack2. `greenpack -msgpack2` produces classic msgpack2, and handles nils. Cousin to ZebraPack (https://github.com/glycerine/zebrapack), greenpack's advantage is fully self-describing data. Oh, and faster than protobufs.

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