(WIP) Metadata of C# (and other) Assemblies.

Better support for loading C# (and other) dlls (we need IsFSharp to be **false** to get all methods in "MembersFunctionsAndValues"). This will be used by FSharp.Formatting for example.

I used this with success in https://github.com/tpetricek/FSharp.Formatting/pull/208 but I'm not exactly sure what I have done :)

If somebody can comment on this why it's needed or why it's wrong that would be nice. It looks line the right thing to do would be to get the ccu from the entitiy, but this seems to be impossible in this case (because it is not unresolved).