Handling of `NSArray` for library function names

[gfx-rs]

Handling of `NSArray` for library function names

[kvark]

Summoning @scoopr for an opinion.

Just to clarify, the breaking itself is fine from the SemVer point of view, since we bumped the version to 0.15. The fact that this code no longer works is a bit sad.

Perhaps, we could expose a method that gets a raw *const objc::runtime::Object and gives you Vec<T>?

[scoopr]

Oh, I don't really have an opinion here.

I guess I missed between the initial solution searching and the final PR forming that I had actually changed a public method signature. I suppose a helper method of sorts would make sense here.

Alternatively, a return type of Vec<String> would probably be ideal from the api use side, but of course wouldn't be quite zero cost. Also I suppose a impl Iterator would work too