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7ab477866e
Extract Platform to a separate crate. This moves the `Platform`, `Cfg`, `CfgExpr` types to a new crate named "cargo-platform". The intent here is to give users of `cargo_metadata` a way of parsing and inspecting cargo's platform values. Along the way, I rewrote the error handling to remove `failure`, and to slightly improve the output. I'm having doubts whether or not this is a good idea. As you can see from the `examples/matches.rs` example, it is nontrivial to use this (which also misses cargo's config values and environment variables). I don't know if anyone will actually use this. If this doesn't seem to have value, I would suggest closing it. I've also included a sample script, `publish.py`, for publishing cargo itself. I suspect it will need tweaking, but I figure it would be a start and open for feedback.