Use the version in the .csproj if there is no local git repository.
Always use Windows line endings in codegen output.
Update build dependency versions. We're still using GitVersion 5.1.3 because of https://github.com/nuke-build/nuke/issues/509.
.NET Core 2.1 introduced some runtime changes to support Span<T> and ByReference. Along with this comes the ability to do things like reinterpret memory as a different type. In .NET Framework the garbage collector couldn't track these references. These features proved useful enough that support for .NET Framework was dropped.
* Target netstandard2.1 and netcoreapp3.0
* Build: Zip native builds. Put version in zip filename
* Always build native exe on AppVeyor
