Exec Task: make it possible provide arguments to a command in a platform independent manner

[tmds]

The Exec.Command parameter is platform dependent.

ProcessStartInfo.ArgumentList provides an API to specify arguments in a platform-independent way.

It would be nice if it was usable from Exec.

Besides being cross-platform, such processes could be spawned directly my msbuild instead of wrapping them with an intermediate script.

Example:

      <Exec FileName="dotnet" Arguments="new;web;-o;$(OutputLocation)"/>

cc @rainersigwald

[tmds]

@benvillalobos what does 'up-for-grabs' mean? Do you approve the feature request and can someone start working on it?

[benvillalobos]

@tmds thanks for pointing this out. We're open to seeing at a high level what the change would look like and discussing it from there. I added the needs design label to reflect that.