Provide Visual Studio LightBulb style fixup support for <reference> and import statements

[gautamsi]

It would be really helpful to be able to fix import statements in editor by using ctrl+. or clicking lightbulb style in visual studio 2015.

example from 2013 style c# using statement fix support.

TypeScript is being adapted for many large projects, being modular is also a goal for large projects. it would be nice to have these features.

[mhegazy]

Should be fixed by #11768