Add SourceLink support and nuget symbol packages (#1930)
Add SourceLink support and nuget symbol packages (#1930)

* Add DotNet.ReproducibleBuilds to all projects

This enables SourceLink and debug symbol embedding, among other things.
https://github.com/dotnet/reproducible-builds

* Add DotNet.ReproducibleBuilds.Isolated to all projects
This prevents the build from relying on outside libraries not described
in the repo.
oxyplot/oxyplot,ze-pequeno/oxyplot