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Fixes #458

Fixes #453, a crash caused by Newlib having ARM instructions in
the Thumb-only Cortex-M0+.

Fixes #447

In order to be consistent the other tools in the directory.

 Correctly use earlephilhower.varant if variant not given, ensure USB power macro is always there (#444)

Fixes a crash of the builder script, `board.get("build.variant", None)` will throw an exception if the `build.variant` was not found (and not return `None` as the fallback value), but an empty string works, so check against that.

USB power defines moved directly into the board files, but still ensure that the macro always exists (with a default fallback value) to not fail the build.

As part of the boards.txt generation, also make necessary files for
Platform.IO.

Fixes #399

Thx!

Fixes #416

Fixes #427.  The libpico.a build already includes the HW interpolator
sources, but the include was missing from the Arduino path.

Also clean up output in SpeedTest, make more human friendly

Keyboard class now has support for non-en_US layouts, and documentation has
been added to the Mouse class.

Thanks to @rico0260 for letting me know about the update, and for the initial PR!

The Pico HW seems to generate an interrupt on the end of every I2C
write cycle, even if the slave address wasn't actually targeted.
This would cause the onReceive method to be called with a 0-len
parameter for every write on the I2C bus.

Now, only call onReceive if there is 1 or more bytes of data available.

SdFat used to point to unnamed commit in the ESP8266SdFat repo.
Master in that repo has now been moved to that commit, so make this
core use the master branch for sanity's sake.

Fixes #418

Fixes #373 

Fixes #411

Allow setting the size of the receive buffer by the application using a
call to Serial1/2.setFIFOSize(xxx) before the begin() call.

Defaults to 32 bytes, like the HW Serial ports, but can be set to
any desired value when instantiated.

When the Serial software FIFOs overeflowed, the IRQ handler would not
read any more data from the hardware FIFOs.  This would cause the
IRQ handler to be continually called as soon as it exited since the
HW FIFOS were not empty.

Now always read every available HW FIFO entry and throw out any that
don't fit in the SW FIFO.

Also fix a too long by half stop bit timing in the PIOSerial receiver.

Fix issues with [WiFiNINA](https://github.com/arduino-libraries/WiFiNINA) and [WiFiNINA_Generic](https://github.com/khoih-prog/WiFiNINA_Generic) libraries

Fixes #373
Fixes #375 
Fixes #376 

Fixes #368.  Thanks @bperrybap!