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Thanks to @me-no-dev for pointing out that the Picoprobe does UART
passthrough!

Update the ArduinoAPI with new macros/inlines that allow accessing
values that are not naturally aligned (i.e. an int at address 0x0001).

Fixes #79

Last step before 1.0. Docs for readthedocs.io.

Update the I2S API to mimic others where `setXXX` is called before
`begin()` to set the GPIO pins used.

The SDK would assert if a flash write/erase happened past the end of the
flash space it was built with.  So, 8MB chips would crash when accessing
offset 3MB, for example.

Avoid this by specifying the maximum flash available so the SDK won't
trip.

Fixes #76

Pull in the ESP8266 File/Dir/etc. filesystem and port LittleFS
and SD/SDFS to the RP2040.

See https://arduino-esp8266.readthedocs.io/en/latest/filesystem.html
for more information

Using the PIO-driven I2S from pico-extras, add I2S output support.

Be sure to `git submodule update --init` to get the new directories.

Heise.de seems to have been confused by the menu options for the
filesystem/sketch selection.  Explicitly list the Sketch and FS sizes in
each menu tem to avoid future confusion.

Instead of duplicating output call in all children, fork ArduinoApi and
add it in the Print base class.

reference: cores/rp2040/wiring_analog.cpp:108:extern "C" float analogReadTemp()

Testing in #42.  Thanks @blurfl!

Build all 4 different boot_stage2 objects with SPI/2 and SPI/4 options.
Add a menu to the generic board to allow selecting between them.
Use the potato/4 boot2 for the Adafruit Feather until we have a better
version verified.

Fixes #42

Fixed the calculation of the pwm clock divider to be the system clock hz divided by the product of the analog frequency and scale.

Add BOOTSEL, allowing BOOTSEL use as a button

Since every board has a bootsel button, allow end users to read its
state with a simple `if (BOOTSEL)`.  Uses code from the pico-examples.

Add picoprobe upload support, cleanup up boards

Update version header when rebuilding libpico

Always enable USB serial port for reset

To allow for uploads when sketches don't manually start the Serial port,
start the USB port always in main().

Recognize /dev/cu in args.serial

Sketch upload to serial port fails on macos because the Arduino IDE uses the callout device "/dev/cu". Adding recognition of "/dev/cu" to uf2conv.py makes the sketch upload work.

Fix Pyton on RPI, EEPROM start address in LD file