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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.

Add non-standard library calls used by String

Borrowed from https://github.com/esp8266/Arduino , include dtostrf() and
others.

Fixes #13

for the cases where one of the UARTs is used.

Thanks to @me-no-dev, the serial monitor issue was traced down to
DTR/RTS settings in boards.txt.  Clean those up and the monitor seems to
work perfectly now.

OpenOCD still needs to be added for this to work :)

Use chunks not bytes to transfer data to host, like in the serial_usb
SDK.

Add a symlink to the repo to point to the ArduinoAPI submodule instead
of requiring manual addition after athe first `git clone`.

Added size validation to the EEPROM begin, but forgot to set the class
variable with the new adjusted size.
Fixes #10

Forgot to `git add` a wiring file.  Fixes #11

Use CDC class for the USB serial port

Fixes #8 and some other weirdness seen when going between computers.
Use the CDC and not MISC class to identify the Pico

Allow for spaces in paths of the platform/core/etc.

Properly quote all instances of file paths and runtime paths in the
platform file to ensure thathaving a username with spaces in it won't
break the compile.

Fixes #6