Cannot properly handle conditional compilation

[andry-tino]

When emitting for a file like:

#if VAR
[ScriptNamespace("MyNamespace")]
#endif
public class MyClass {
}

The generated output will miss the new namespace. However the referenced type will actually be correct as, there, we use the semantic model.

[andry-tino]

Need to verify that the work for #41 solved this issue.