Function to change the SysProcAttr values

[joshbarry92]

Optionally be able to update the SysProcAttr values that are used in the SpawnWithArgs function.

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[joshbarry92]

I registered my account with my @google credentials

[googlebot]

CLAs look good, thanks!

[joshbarry92]

Added some comment changes to clarify the use.

[skalle]

Thx for contributing!