GH1172: Adding GetStandardError to IProcess and RedirectStandardError to ProcessSettings

[CaptainCow95]

Adds the ability to redirect the standard error in the same way that you can currently redirect standard output. Related to #1172

[dnfclas]

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[dnfclas]

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[devlead]

@CaptainCow95 Hi are you in a position to rebase this against latest develop?

[CaptainCow95]

I'll try to get to it tonight.

[CaptainCow95]

Should be all synced up now.

[devlead]

LGTM 👍

[devlead]

@CaptainCow95 this is now merged and will be avail in next release, thanks for contributing 👍