Accept label_string_dict for includes

[abergmeier-dsfishlabs]

Description of the problem / feature request / question:

Once we have label_string_dict (or whatever it will be called), it would be great if the reach of include statements could be controlled by labelled dicts. Something like:

includes = {
  "//visibility:public": "include/",
  "//visibility:private": "src/",
},

where public gets derived by dependants.

[laurentlb]

I need more context. Are you talking about the C++ rules?

[abergmeier-dsfishlabs]

I need more context. Are you talking about the C++ rules?

Yes. I do think though, that this is not the best idea. Would rather have it accept a custom object, which wraps visibility similar to select.