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Fixes #2136

Co-authored-by: Dominic Pearman <dominic@phymorous.de>

* functions to set PDM pins

* change pin set method to better match existing libs

Co-authored-by: Dominic Pearman <dominic@phymorous.de>

The lwipopts.h file started with the PicoW example one, but no longer
tracks it, so remove the EXAMPLE define guard.

Fixes #2123

Fixes #2037

Fixes #2105

W5100 doesn't support isLinked, so no change needed there.

Fixes #1870

Fixes #2033

Same pinout as the plain Pico, just different flash and # of GPIOs

Fixes #2054

Fix #2094

* 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

Hi,

Just a typo and a couple of wording corrections.

Fixes #2047

Fixes #2034

Fixes #2019

Fixes #2008

MACs are 6-bytes long, not 8.

See https://github.com/earlephilhower/arduino-pico/pull/2001#issuecomment-1944461469

Remove the HW random generator call while initting LWIP to avoid the SDK
looping forver due to FreeRTOS exception/timer interrupts.