uni

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This PR does 3 things:

• Cause the child process to be stopped with SIGTERM instead of SIGKILL. SIGKILL is still sent if the process has not stopped after a fixed period.
• Start the child process in its own process group so that stopping the child will also stop any of its owned processes.
• Intercept SIGKILL/SIGTERM in uni itself and trigger a shutdown of its child process

Resolves #10

Note: @kendru reported that this has some subtle bugs still.