CLI: sort reports by word list & location

Ideally I'd like to sort by word list, and then by location

Questions/Thoughts:
- Should `Report` impl `Ord`? I don't think so
- Should `Location` impl `Ord`? It could, but how do you manage axis order?
- Currently they're unsorted due to use of a `HashSet`
- Sorting alphabetically is an easy option but probably not what people want (personally I'd want more common axes sorted first, like wght and wdth)
- We could use insertion order, but we'd have to pull in a new dependency for stable maps
- Or we could use axis order for the font, but this means you must have a reference to a font to be able to sort. I think this is my current preferred option
- Exemplars are already sorted, so no more details to sort on