Support for PowerShell cmdlets in admin mode

[ryfu-msft]

Related to: #221

Initial Proof of Concept: master...JohnMcPMS:winget-cli:ps-admin

This PR adds support for calling an elevated PowerShell and having elevation flow through the installer.

Changes:

• Changes Activation path in PS based on elevation, blocks if running as SYSTEM
• Targets test CLSIDs and devServer by default
• Git ignores files generated from IDL
• If create instance fails, launches server using CreateProcess
• Terminates server if another server is already present
• Requires a secure connection via RPC flags and security descriptor.
• Adds E2E test for PowerShell cmdlets. Build pipeline runs these in admin mode so this feature should have sufficient test coverage.
• Exposes an export in WindowsPackageManager project to allow for the COM server to call for logging WIL results.

Microsoft Reviewers: Open in CodeFlow

[JohnMcPMS]

src/WinGetServer/WinGetServer.idl is showing as binary; it probably needs some BOM added or removed to get it to show as text here.

[yao-msft]

/azp run

[azure-pipelines]

Azure Pipelines failed to run 1 pipeline(s).

[ryfu-msft]

/azp run

[azure-pipelines]

Azure Pipelines failed to run 1 pipeline(s).

[ryfu-msft]

/azp run

[azure-pipelines]

Azure Pipelines failed to run 1 pipeline(s).

[yao-msft]

/azure-pipelines.yml (Line: 174, Col: 12): Unexpected value ''

[msftrubengu]

<ProjectReference Include="..\..\UndockedRegFreeWinRT\UndockedRegFreeWinRT\UndockedRegFreeWinRT.vcxproj">

Don't you need to update this?

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Refers to: src/PowerShell/Microsoft.WinGet.Client/Microsoft.WinGet.Client.csproj:41 in 190a6b9. [](commit_id = 190a6b9, deletion_comment = False)