Human Readable Overlay Names

[RobLoach]

Right now, when you load up the Overlay Presets, you're presented with a directory structure of overlay directories and files. While it is workable, it would be nice if we applied some clean up of the names to make them a bit more readable for the end user.

Rather than having them just be under-cased directories and file names, I'm proposing renaming these a bit to seem a bit more human readable, not only for the parent folder, but also all children files/folders...

[hizzlekizzle]

That seems good to me. I'm down for renames, too. E.g., should CTR be changed to 3DS?

[RobLoach]

Update on this one... RetroArch has hardcoded the overlay paths, so we won't be able to tak ethis one on.