Obsoletes RazorViewAttribute and RazorPageAttribute and removes all of
our usage of them. I've already made the changes to have the SDK stop
generating these.
As a result of removing Razor's VS projects and upgrading all projects to netcoreapp3.0, we no longer need dependency variable for .NET Core 1.x and 2.x and Visual Studio packages.
Changes:
* Remove 'StandardTestTfm'
* Remove variables for .NET Core 1.0, 1.1, 2.0, 2.1, and 2.2
* Remove VSIX variables
* Stop generating 'branding.props' - this hasn't been used in a while and is no longer needed
Replaces package references the following packages with local code:
Microsoft.AspNetCore.Certificates.Generation.Sources
Microsoft.Extensions.CopyOnWriteDictionary.Sources
Microsoft.Extensions.ClosedGenericMatcher.Sources
Microsoft.Extensions.ObjectMethodExecutor.Sources
Microsoft.Extensions.PropertyActivator.Sources
Microsoft.Extensions.PropertyHelper.Sources
Microsoft.Extensions.RazorViews.Sources
Microsoft.Extensions.SecurityHelper.Sources
Microsoft.Extensions.StackTrace.Sources
Microsoft.Extensions.WebEncoders.Sources
Ryan Nowak
Nate McMaster
Nate McMaster
James Newton-King
Ryan Brandenburg