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Kill subprocesses correctly on each platform on Ctrl-C#13
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Running commands like "rojo serve" and pressing ctrl-c does not kill the rojo process as intended. Foreman should pass the signal to the tools it runs. This PR implements the same solution from [Aftman](LPGhatguy/aftman#13) Manually tested ctrl-c kills subprocesses on M2 mac and Windows machines Added 2 scripts to CI to test subprocess are properly killed on linux and windows machines
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On Unix, process groups don't reap child processes when the parent process dies. Windows job groups do!
This PR introduces a separate code path for Unix systems that uses tokio's process API instead, and wires up a few signals to explicitly kill the child process.