Support for specifying the Partner ID

[WodansSon]

(fixes #2393 )

[WodansSon]

I have chosen not to document this new attribute for a few reasons:

• This is very specific to Microsoft Partners and would just be noise for a vast majority of our users.
• There will be a blog about this being exposed
• Our technical writer will be creating a walk-through explaining how to use this attribute which will be hosted on the docs website.

@tombuildsstuff @katbyte

[katbyte]

LGTM @jeffreyCline 👍

[WodansSon]

@tombuildsstuff I moved this into 1.21.0 release since I think there is still time to get it in. If you disagree feel free to move it back out into 2.0.0.

[metacpp]

LGTM but some minor.

[tombuildsstuff]

@jeffreyCline after chatting about this with @katbyte we're going to add a brief description into the "advanced options" section, which longer-term can point to a separate blog post for more info :)

[tombuildsstuff]

one minor comment about where the documentation should live (which I'll push a commit to fix) but this otherwise LGTM 👍

[tombuildsstuff]

It's green in Travis - no idea why it's still showing as pending ¯_(ツ)_/¯

[ghost]

I'm going to lock this issue because it has been closed for 30 days ⏳. This helps our maintainers find and focus on the active issues.

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