The main reason is that BlocksDS doesn't have any bug with NitroFS, and
NitroFS is strictly required to use NFlib. With devkitPro, melonDS won't be
able to run any program made with NFlib due to a bug with NitroFS.
- 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.