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* Remove redundant/wrong second board.mcu in boards.txt

Fixes #380

Boards.txt had the setting board.mcu twice.  The first one was correct,
while the second one wasn't and shouldn't have been there.  Remove it.

* Include fix from @rei-vilo in #381

Because the hardware FIFO is quite small and doesn't report the actual number
of bytes available, implement a software FIFO that will pull all available
bytes out of the HW FIFO on any Serial call.  It's not as efficient or as
bulletproof as an IRQ based method, but it is simpler to implement and can
help with issues like #378

Adding definitions for internal reset and mode pins for ESP8285.

Fixes #348

Add the RTC header path in the SDK to the Arduino build path.  Also add
pico_utils to the libpico.a for the datetime_to_str call.

Note that the pico_sdk has a bug in the datetime.h header so you need to
manually bracket the include file as "C":

extern "C" {
    #include "pico/util/datetime.h"
}

By default RTTI (Run-Time Type Information) is disabled because most apps
don't need run time type info enabled.  However, certain libraries expect
to be able to query types of objects at runtime, so add a menu to enable it.

In `pinMode()` I think it would be better to call `gpio_disable_pulls()` on the ulPin when ulMode == INPUT.
Adding `gpio_disable_pulls(RP_PIN);` after `pinMode(RP_PIN, INPUT);` solves the issue.

Fixes #312

* Add package.json

To make package easily integratable with PlatformIO

* Correct name back to original one

* Format package.json

* Add first shot at builder script

* Add USB stack flags, fix compile flags

* Formatting

* Add more link & USB flags

* Build Boot2 bootloader

* Formatting

* Generate linkerscript, linker fixes

* Fix linkflags, make firmware runnable

* Update USB flags and RAM size

* Correct USB flags, add dynamic sketch partitioning

* Restructure filesystem size and flash size logic into platform code

* Move C++ only flags to CXXFLAGS

* Add PlatformIO documentation

* Link to new platform.io document in the docs TOC

* Fix typos in platformio docs

* Fix one additional typo in platformio.rst

* Update docs

* Remove wrongly commited build folder

Reset the SDA and SCL pins to INPUT at Wire.end() to prevent multiple pins connected to I2C when changing pins (#302)

Fixes #289

Per #276, #277, #274 there seems to be an issue with interrupts and some
other low-level ARM operations when using the distributed libstdc++.

Use the default libstdc++ built with the toolchain, instead.

Fixes #277
Fixes #276
Fixes #274

* Adds support for Challenger RP2040 WiFi boards

* Added Challenger board to makeboards build script

* Adds new challenger board with LTE modem.

* Updated after getting approved PID from Raspberry Pi