- Allow >= RC3 CLI's to build and run MVC.
- Added extra sln's so they could be opened in VS. Currently VS' project system can't currently handle Mvc.sln.
- Worked around several dotnet migration issues. They are listed in the re-attempted migration section here: aspnet#5482
- One large feature bit that couldn't be worked around was the functional tests running on desktop; it represented several known vstest issues. Removed desktop running of functional tests.
- Skipped an ActionContextAccessor test due to a vstest appdomain problem.

- see 63507c8 for previous, project.json work
- xUnit no longer supports .NET 4.5.1
- build tests for desktop .NET only on Windows
- always place xunit.runner.visualstudio dependency after xunit; helps build scripts run correctly

Question: Should Microsoft.Extensions.DependencyModel dependency really be 1.1.0?

…s from dev

- manually recreate *.sln files to correct VS versions and use old project GUIDs
  - add missing lines to the .sln files; build configuration likely not used before
- manually migrate RazorPagesWebSite project
- remove `ToolsVersion` attributes
- add repo.props file; never test TestCommon project and only build Mvc.sln
- add dependencies.props file to match other repos

Test-related:
- add `$(PreserveCompilationContext)` to test projects that examine their own dependencies
- remove comments from xunit.runner.json files; xUnit does not support them
- remove .notest files
- work around inability to deserialize a odd `ref` type
  - xUnit and vstest now serialize / deserialze test data more often
- work around microsoft/vstest#419 instead of skipping test
- enable testes that hit microsoft/vstest#427; bug has been fixed
- add `<Service>`s to test projects

- build unconditionally creates a package if this is in the shared folder
- basically, remove the .xproj that's in old world and compile the files in

- re-enable .NET Framework run of the functional tests
  - disable shadow copying
- add support for `/p:GenerateBaselines=true` for functional and Razor.Host tests
- remove aspnet/KoreBuild#182 workaround; bug fixed
- remove `Microsoft.DotNet.InternalAbstractions` and `System.Xml.XmlDocument` dependencies
- stop floating `$(CoreFxVersion)` and `Microsoft.Extensions.DependencyModel` dependencies
- separate `GetCSharpTypeName_ReturnsCorrectTypeNames_ForOutParameter()` test
- remove `$(RuntimeIdentifier)` settings

nits:
- remove all web.config files
- remove conditional compilation from class libraries
- remove unnecessary project properties from `UserClassLibrary`
- move a few properties to the top of a .csproj file
- remove some trailing whitespace in .csproj files

…cListener a regular class library