Changes:
* Make Visual Studio 2019 a prerequisite for building this repo
* Update .sln files
* Update Windows SDK to 17134
* Update developer docs
* Disable ANCM tests
* Update to .NET Core SDK 3.0 Preview 2
* Use Microsoft.NET.Sdk.Razor as a package consistently accross the repo
* React to changes in metadata from Microsoft.NETCore.App
* React to changes in .NET Core SDK
* Attempt to workaround CodeCheck.ps1 failure which doesn't repro locally or on different agents. Possibly due to differences in the version of the PowerShell task?
* Remove dead YML file
* Rename usages of win7-{x64,x86} to win-{x64,x86}
* Update KoreBuild to 3.0.0-build-20190219.1
When a `<Reference>` is named `*.Sources`, set PrivateAssets=All (exclude from generated nuspec) and IncludeAssets=ContentFiles (only consume content files, not .dll's)
This is required to workaround several limitations in the way the .NET Core SDK finds shared frameworks and targeting packs. It allow tests to use shared frameworks and targeting packs.
It also matches the patterns established in other aspnet and dotnet repos. This should reduce the friction required to adopt Arcade SDK.
## Changes
* This moves the default location of the .NET Core SDK installation into `$repoRoot/.dotnet`. This location was already in use for CI builds.
* Update the build step for Microsoft.AspNetCore.App to install the shared framework into the local copy of the .NET Core SDK
## Recommendations
* Use the "startvs.cmd" script to launch Visual Studio. This will set required environment variables to make VS happier than if you just double click the .sln file.
* Use "activate.sh/ps1" if you want to run `dotnet build`, `dotnet test` and other dotnet commands. These will set required environment variables, including PATH.
* I recommend removing %USERPROFILE%/.dotnet to your PATH variable if you had added it manually before. This will no longer match what build tools will install.
* `git clean -xfd -e .dotnet/` preserves the folder so you don’t have to re-download the SDK again.
Nate McMaster
Hao Kung