* Remove sources that have now migrated to the central AspNetCore repo
* Move remaining blazor/src to src
* Update readme; rename .sln file
* Clean up .sln file
* Remove unnecessary files. Simplify build config.
* Ensure correct build order
* remove sources.props and use NuGet.config. Source.props is only necessary for products that bulid in ProdCon, which Blazor does not
* Remove code signing glue code. This is part of KoreBuild now
* Update SDK to 2.1.400
* Update certificate names used for code-signing to use SHA2
* Change project layout to prepare for upcoming Arcade changes
* Add signtool config file to configure OPC, NuGet, and Authenticode signing
* Fix a bug when BaseIntermediateOutputPath is set to an absolute path