refactor/pty: manually fork and exec #64
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std::process::Command is too heavy and synchronous (It returns after the exec started, not after fork)
Get rid of yanked crates
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std::process::Commandis too heavy weight. To lessen the requirement of pre_exec fromFnMut()toFnOnce()and simplify future work(we need it to return after fork, not after exec), manually fork and exec.