Add Nice config option to lower chia processes priority about plotng HOT 4 OPEN

I'm not super familiar with process priorities but I found this thread which is for linux. And the documentation of the same thing for Windows.

cmd := exec.Command("chia", args...)

# linux
err = syscall.Setpriority(cmd.Process.id, who int, prio int)

# windows
err = windows.SetPriorityClass(process handle, priorityClass uint32)

Not sure if syscall.Setpriority works for Mac OS or not.

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I second this. Some other scripts already do it and feels smooth to use the computer while plotting.

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Sorry, but this is a Windows Task Manager option, not available to the programming API I am using.

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And in Linux, doesn't it work? I guess there must be some kind of way to specifiy it. Last resort, just invoking "nice chia " will do the job. Thanks.

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