.NET Core 2.0 reached EOL last year. This removes multi-targeting our test projects and test assets to only use .NET Core 2.1 and .NET Framework 4.6.1.\n\nCommit migrated from 084494d21d
In preparation for merging many other projects into this repo, this establishes a new source code organization which groups projects together based on subject matter.
\n\nCommit migrated from 7ce647cfa3