Building Python/WinRT projection in Azure Pipelines

[devhawk]

Note, this PR is squash merged branch so CodeFlow users can review this PR.

• Original PR Building Python/WinRT projection in Azure Pipelines #331
• Original topic branch: https://github.com/Microsoft/xlang/tree/devhawk/buildtest

This PR includes azure pipelies yaml files to enable building the full Python projection of WinRT in Azure Pipelines. An example Azure build of this branch is here: Example Build: https://dev.azure.com/msft-xlang/public/_build/results?buildId=1877. Additionally, the full signed proejction is available from test.pypi at https://test.pypi.org/project/winrt/.

Notes:

• src\package\pywinrt\projection contains two pipeline yml files - pipeline-internal and pipeline-public. The only difference between the two pipelines is the addition of a signing step for pipeline-internal. Both yml files use templates from src\package\pywinrt\projection\AzurePipelinesTemplates to eliminate duplication.
• src\package\pywinrt\projection\AzurePipelinesTemplates\steps-build-projection.yml reads the projection type from a queue time build variable. If the value of ProjectionType is "full", it generates the full WinRT projection (except for Windows.UI.Xaml and Windows.UI.Composition which are not supported by Py/WinRT yet). Otherwise it generates the small partial projection. The public projection build pipeline defaults to partial projection. Internal projection build pipeline defaults to full projeciton.

Other Changes:

• For packaging purposes, the binary extension now lives inside the top level package rather than as a sibling of the python code package
• removed code from generated setup.py file for compiling the extension module.
• wrap functions in generated cpp files in a namespace to enable unity builds (i.e. combining multiple cpp files into a single compilation unit). Not currently using unity builds, but we experimented with using them. We kept the code gen change in order to enable maximum flexibility in build pipeline creation down the road
• Add precompiled header support to generated projection
• The full projection uses a custom setup.py file rather than the one generated by pywinrt

[devhawk]

here's the link for the publci build of this branch: https://dev.azure.com/msft-xlang/public/_build/results?buildId=1888

[Scottj1s]