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Fixes #222

The HW needs to have the TXC_ABRT flag cleared when a slave transmission is
cut short by the master, or else it will effectively break the I2C bus and
never recover.

The O_CREAT/etc. flags on the Pico are a full 32-bits in size, but the
core was generating a flag for SdFat using an 8-bit type, so all the
O_CREAT, O_TRUNC, O_APPEND, etc. flags got cut off.

Fix the flag size.

Fixes #214

Serial1.flush/Serial2.flush was not waiting for the proper FIFO to clear.
Use the proper call from the Pico SDK.

Thanks to Peter Remias for noting it.

* Add PDM library for Arduino Nano RP2040 Connect

* No PDM test in CI, only works on Arduino Nano RP2040

Thanks to @Claupio for the bringup!
Reference #208

Fixes a hang when reading from the Serial UART ports because before the
core would pause indefinitely for the next character.

Now, wait up to Serial.setTimeout() milliseconds and if it times out
return -1 to the app.

Fixes #210

Minor rev to the tinyUSB version used, new ID function.

The PIO programs that generate tone() and Servo() use the TX FIFO to
receive updates to the period/duty cycle.

The original code would push into the FIFO (potentially blocking the
app if the FIFO was full) and generate at least one cycle of every
value written into the control.  Basically, the output would
lag the changes by 1 cycle or more (which could be 20ms+ on Servo).

Fix this by clearing any old, ungrabbed values from the FIFO before
sending a new one to the program.  Instead of a FIFO, there is
effectively now just a control register and updates will be immediate.

Update the Siren.ino example with delays because now the tone() calls
will not block and run 10x+ faster.

Many functions are defined inside the api/Common.h, so remove them from
the Arduino.h header to have them appear only once.

Fix up the abs() macro to avoid macro problems, add round()

Fixes #202

It's still OOS, so hookup taken from their schematics.

GCC 10.2 has a bug which causes Windows to rebuild every library on every
compile, instead of caching the first results.

Upgrade to GCC 10.3 which has this fixed.

Add proper OpenOCD executables for non-Linux x86_64 archs.

* add two variant files

* add trinkey and stemma friend

* add fast SPI transfer using pico-sdk blocks

* update makeboards.py for new variants

- STEMMA Friend RP2040
- Trinkey RP2040 QT

* run astyle on SPI library

* fix auto -> ssize type

* astyled

* woops ssizet != sizet!

* a nice day for a new board definition! this is a macropad with 12 keys, oled and rotary encoder
Co-authored-by: hathach <thach@tinyusb.org>

Fixes #121
Supersedes #185

Redo the PIO program to allow the tone generator on a pin to be updated
without interruption, at waveform boundaries.  This allows for things like
sirens or slurs to be implemented simply.

Use an alarm, not the PIO hardware, to manage time-limited tones().

Add a simple siren example.

When multiple libraries contain files matching an #include directive in the program, the Arduino build system must pick
one to use for compilation. Multiple factors are used in order to make an intelligent determination of which library is
best.

In order to enhance this determination, the closeness of match between the library.properties name value and the
filename in the #include directive is being added as one of those factors. This new factor is referred to as
"Library Name Priority".

Unfortunately, this change can result in platform bundled libraries which had previously been correctly correctly chosen
no longer being given priority over their equivalent standalone libraries, which may be incompatible or not optimized
for the platform's boards.

This priority inversion only occurs when all the following conditions are true:

- There is a standalone library installed which provides a header filename collision.
- The platform bundled library is architecture optimized (e.g., architectures=esp32).
- The standalone library is architecture compatible (architectures=*).
- The standalone library has equal "Folder Name Priority".
- The standalone library has better "Library Name Priority" (e.g., name=SD vs name=SD(ESP32) for a library with primary
  header file SD.h.

The fix is to simply give the platform bundled library a perfect "Library Name Priority".

Some platform bundled libraries were given a modified name as a workaround to a bug in the Arduino IDE's Library Manager
which caused Library Manager to always show the library as updatable under specific circumstances. That bug was fixed in
Arduino IDE 1.8.6, ~3 years ago.

Fixes #169

Trying to change pinout while running, or to an illegal configuration,
will now immediately panic() with an error message.  Such an attempt
is a pretty big problem since pinouts are hardware related/static.

Prior code would fail silently and return false, but nobody checked
the setXXX return values, anyway.

Fixes #167

For Serial when selecting TinyUSB.  Can't include in the core because Arduino IDE
will not link in libraries called from the core.  Instead, add the header to all
the standard libraries in the hope it will still catch some user cases where they
use these libraries.

See https://github.com/earlephilhower/arduino-pico/issues/167#issuecomment-848622174