Powershell: PSVersionTable needs an *OS* key

[Jaykul]

We need to be able to _at least_ tell whether we're on Windows or Unix _from the PSVersionTable_.

Ideally, I'd like to be able to differentiate Windows Server, Windows Desktop, Nano Server, OS X, and BSD from Linux.

Since PSEdition Core runs on Windows (and even Windows Desktop), and since CLRVersion will presumably be the same across all versions of Core (even if it were populated #1984), and since "BuildVersion" is going _backwards_ ...

I also think that PSVersionTable should expose "Architecture" (ARM, AMD64, x86).

[kilasuit]

Agreed and suggested this in #1936 as well as a change to the Issue template to make issues easier to track

[rkeithhill]

It would make for a nice way to gather information for a bug report. I like. And on Linux, you probably want the specific version i.e. not just Ubuntu but something to distinguish between 14.04 and 16.04. Also, Architecture needs to disambiguate between OS architecture and current process architecture e.g. PowerShell x86 running on Windows x64.

[lzybkr]

Dupe of #1635.

[Jaykul]

Sorry. I couldn't find it (searching for PSVersionTable is pointless in here)

[MaximoTrinidad]

I agree!
+1 for Jaykul

[lzybkr]

No problem, I opened it, so I knew it was there. I did search for PSVersionTable first, way too many hits, so added OS and many fewer hits.