Add functionality to detect sw600dp and sw720dp

@peter-budo 

Do we want to have the variable+getters in our `Bf4Intel` application class instead, so that it's only available in one place?

Pros? Cons?

Right now I'm making sure that `sw720dp` *isn't* `sw600dp` - do we want that behavior, or should `sw720dp` devices report that they're `sw600dp` too (programmatically)?