Rewrite CSharp part using Mono.Cecil

[antifree]

To support generating documentation for .net461 and other assemblies, we can rewrite the loading part using MetaDataLoadContext. Here is an article https://docs.microsoft.com/en-us/dotnet/standard/assembly/inspect-contents-using-metadataloadcontext

[antifree]

@korzh After investigation, I've decided that the best approach to support all targets is to use Mono.Cecil

[antifree]

Done in dev.