RunCommand: use IPC::Run3::run3 instead
run3 just seems to do better handling for what we want to do, and requires less deep-reaching changes to this plugin to get it to play nice, as IPC::Run::run would.
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run3 just seems to do better handling for what we want to do, and requires less deep-reaching changes to this plugin to get it to play nice, as IPC::Run::run would.