As discussed in aspnet/Home#3292, we're reversing course on the implicit package version feature. This adds a package version for Microsoft.AspNetCore.App to the `dotnet new` and VS templates.
- Generate the template config file to include package versions as listed in dependencies.props
- Update template cs/fsproj files to use variables per package
- Fixup tests to run better on Linux/macOS
Ryan Brandenburg
Nate McMaster
Nate McMaster
John Luo
Pranav K