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Fixes #472

Instead of using interrupts, explicitly call the IRQ handler dueing Serial
read/peek/available calls.

Add to keywords.txt for syntax hilighting.

Add poll calls in the SerialUART::write-like calls (write,
flush, etc.)

Really remove division from IRQ routines/

Microsoft is deprecating WMIC, so fall back to a Powershell call in
case of failure to ruin WMIC.

Belt and suspenders, set PowerShell non-interactive mode and null STDIN.

Fixes #468

The FIFO limit was set to 1/2, or 16 bytes on POR and not set by the core,
so for low baud this could result in a LONG time without data moving from
hardware FIFO to the SW ring buffer and timeouts/etc.

Now use the API call which sets it to 1/8, or 4 bytes of data to speed up
the transfer 4x.

Also avoid using the divider in the IRQ routine because it is not clear
from the docs of the Pico SDK IRQ callback routine preserves divider
state or not.  If not, doing division in an IRQ could result in random
data corruption in the main app.

Add memory barriers to ensure the order of data into RAM is preserved
and that GCC doesn't reorder writes.

Change order of tests to favor /run/media over /media. Parse output of udiskctl mount to find mount path

Fixes #464 and other incompatibilities

Remove the timeout check from ::read and ::peek on the SerialUART/PIO
classes  (SerialUSB already ignores it).  See documentation
https://www.arduino.cc/reference/en/language/functions/communication/serial/settimeout/
and thanks to @jandrassy's explanation
https://github.com/earlephilhower/arduino-pico/issues/464#issuecomment-1031657044

Most other boards and the MBED RP2040 support analogReadResolution which
just shifts read data around as needed, with a default of only 10b of
resolution.  The Pico ADC technically supports 12b, but only has about
8b of real data after noise, so you're not really losing anything in the
general case.

Fixes #460

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.