* Add FatFS for onboard flash use/sharing of FAT
* Move all to "fatfs" namespace
The FatFS library defines commonly used names like WORD which could conflict
with user code otherwise.
* Restyle
* FTL-based, wear-leveling FatFS with USB export
Allow using FAT filesystem with onboard flash in a safer, wear-leveled
way and to export the onboard flash to the host as a USB drive for easy
data transfer.
* Update documentation
* Fix submodule reference
* Don't spellehcek ChaN FatFS files
* Disable FTL debugging
* More codespell skips
* Move to latest SPIFTL library
* Allow using raw flash instead of FTL
* Remove unneeded static FIL 4k allocation
* Expose FAT FS format configuration options
* Update documentation
* Remove USB partial flash rewrites
* Remove unneeded dups of FatFS sources
Leave the LICENSE.md and README.md to point to upstream.
* Clean up comments
