The previous license was CC BY-NC 4.0, which doesn't allow commercial
use of the library. Nowadays this exception isn't really helpful, and
it may discourage people that are thinking about using the library (and
may be thinking about maybe selling the ROM in websites like itch.io).
- Bring the source and include directories in nflib to the root of the
repository to match the organization of other libraries.
- Expect users to install NFlib in the devkitPro folder.
- Update all Makefiles for modern devkitPro.
- Remove all redundant copies of NFlib in all examples. The only
remaining copy of the library is in the extras/wifi example, but
that one includes more files, so I have left it untouched for now.