Add .Resource.PathInfo

Which would be a smaller and curated version of what we assign to every resource internally. Instead of adding lots of NameOriginal variants, you would be able to do:

.PathInfo.Name // => roses-are-red.en.jpg
.PathInfo.NameNoIdentifier // => roses-are-red
.PathInfo.Unnormalized.NameNoIdentifier // => Roses are red
.PathInfo.Path

I can outline such an interface if people think it's a good idea ...?

/cc @jmooring