@iSazonov Can you review?

LGTM.

Out of the PR.
@daxian-dbw About "lack of GetAssemblies()" - it seems .Net Core 2.0 has it. Can we remove TypeCatalogGen? I don't found a tracking Issue.

@iSazonov we cannot remove TypeCatalogGen. When you use a type like [System.Net.Http.HttpClient], the type catalog generated by TypeCatalogGen kicks in to figure out which assembly should be loaded. The type catalog also plays a role when you are doing a tab completion on a type like [httpcl<tab>. The reason is that GetAssemblies() can only give you the loaded assemblies, so without the type catalog, you need to make sure System.Net.Http.dll is loaded before using any types from it.

@daxian-dbw Thanks for clarify!
This comment in the code is misleading and must be corrected.

@iSazonov Agreed. I will send out a PR shortly to correct it.