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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

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