* Pass /LIBPATH to linker
Package [Microsoft.DotNet.ILCompiler v1.0.0-alpha-26207-01](https://dotnet.myget.org/feed/dotnet-core/package/nuget/Microsoft.DotNet.ILCompiler/1.0.0-alpha-26207-01)
was failing to compile WebAPI app when using non-developer command
prompt on Windows, because Kernel32.lib and friends weren't get located.
Capturing those from vsvarsall environment in `findvsvarsall.bat` script
and passing it to link.exe fixes the error and compiles WebAPI app
successfully.
* Update docs to reflect the behavior
* Pass required frameworks to the linker on macOS
The `CoreFoundation` and `Security` frameworks are required to link anything that includes `System.Security.Cryptography.Native.Apple.a`.
* Update WebApi instructions for macOS
When iterating on RD.XML changes we shouldn't have to delete all the intermediates to trigger a recompilation.
I took this as an opportunity to make `RdXmlFile` an item. The compiler supports multiple, and so should the project.
Jan Kotas
Ben Adams
Adeel Mujahid
Michal Strehovský
Andon Andonov
A-And