Now that .NET Standard 1.6 target framework is removed, all the .NET Standard 1.6 specific code can be deleted.
Also remove all unnecessary package references which are actually part of .NET Standard 2.0 and Microsoft.Extensions.DependencyModel which was only used in the .NET Standard 1.6 specific code.
Now that .NET Standard 1.6 target framework is removed, all the .NET Standard 1.6 specific code can be deleted.
Also remove all unnecessary package references which are actually part of .NET Standard 2.0 and Microsoft.Extensions.DependencyModel which was only used in the .NET Standard 1.6 specific code.