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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

Add Raspberry Pi binaries, OpenOCD, and new boards

Adafruit Feather, overclocking, flash FS shims

Add support for Adafruit Feather RP2040 (8MB).  Identified with a unique
USB PID so it displays properly once programmed one time.  Moved LED to
pin 13 (per the website docs), but have no board to test.

Add over/underclocking menus, applied at boot.  Use at your own risk, as
usual.

Add shims to allocate flash space for a filesystem (but not implemented
yet).

Add a "generic" RP2040 board

Fix INPUT_PULLUP/DOWN, I2C 0-len probes, timeout

Fix the drive logic for pullup and pulldown inputs.

Add a bitbanged I2C ACK checker for 0-byte I2C transfers (since the HW
doesn't support it).

Add a timeout on I2C reads and writes so they don't hang forever if a
device is not present.

Fixes #38

Add I2C slave support and include a simple example

Also fix the initial pins for the 2nd I2C interface onboard.

Add a CoreMutex class which implements a deadlock-safe mutex and reqork
the SerialUSB and SerialUART classes to use it to synchronize output
when in a multicore sketch.

Remove stdio hacks from libpico.a

Fixes #35

Fixes #34

Add a Gitter chat badge to README.md

Needed to fix link stage to pull in `%f` formatting support.

Fixes #32

Add project size to compile output.  Thanks to @vslinuxdotnet for the work!

Thanks to @vslinuxdotnet for digging into this!  Adds the compiled
sketch RAM and flash usage to the output.

Fixes #17

Set F_CPU macro, remove linker align warnings

Fix attachInterrupt to handle single GPIO callback

Fixes #23

The Pico SDK only supports a single callback pointer for all GPIO
interrupt pins.  So we need to track the individual pin-to-CB map
ourselves and dispatch from our own internal callback routine.

Fixes #25

Add attach/detachInterrupt support

Fixes #21

Use a constexpr template to calculate the valid pins for different IO
hardware.  This lets us have an easily readable list of pin numbers that
we can adjust/check.

Add serialEvent support for USB, UART0, UART1

Clean up gitignore, debug port configuation.  PicoProbe support began.