Exposing STARTUPINFOW.wShowWindow in CommandExt trait
Hi:
I needed a way to control how a new process's window is displayed in Windows (normal, minimized, maximized, etc).
I noticed that there is no direct way to do that (I even searched for crates doing this, but didn't find any).
Inspecting the standard library source code, I figured that it would be a good addition to CommandExt trait that allows some Windows specific customization to a Command.
This is my first time contributing to Rust, so please bear with me if I'm not following the rules :)
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