Extensible directives should output typenames with global::

[NTaylorMullen]

There are several instances where we generate design time code for extensible directives. For example: @stringDirective Foo will generate a design time bit that looks like:

((System.Action)(() => {
 System.Object __typeHelper = "Foo";
}))();

We should add a global:: to System.Object.

[Eilon]

And to System.Action, right?

[NTaylorMullen]

And to System.Action, right?

Of course 😄

[rynowak]

Fixed by 0cb7ae7