[nem-en] Multiple project solutions

[vc]

> Michal just reminded me, that for this to work we would really need to
> share all types loaded from any external assemblies, which is
> definitely more work to do (as I pointed in my first mail on the
> topic). Otherwise any type comparisons during compilation would fail:
> for example if you check if you can call method   f : int -> void
> (imported from external project) using argument of type int from
> current compilation, you must check if int == int, but since they come
> from different LibraryLoaders the comparison fail...
> 
> The solution would be to share library references and use centralized
> storage for created external types...

Yes. It will be fine.