- see #9923 for related discussion
- pin aspnet/EntityFrameworkCore dependencies
- chain aspnet/Extensions dependencies through aspnet/AspNetCore-Tooling instead
- run `darc` to grab the latest
- remove System.Text.Encodings.Web references
- now included in runtime.*.Microsoft.NETCORE.App packages
nits:
- copy a few `ReferenceResolution.md changes from aspnet/Extensions version
Changes:
* Add support for a property, `IsAspNetCoreApp`, in the .csproj file of assemblies which are part of the shared framework.
* Remove unused dependencies
* Remove reference which have become part of 'netcoreapp3.0'
.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.