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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

Ensure no stray files get sucked into the release ZIP by using a clean CI
image to build the package and JSON file.  Auto-populate the draft with
the git commits since the last release.

Fixes #171

Under Windows, it is very hard to make a symlink and by default git won't
make one to the Arduino API directory, causing annoying build errors.

Avoid the issue by duplicating the ArduinoAPI directory explicitly and using
CI to verify that there are no differences between the two.

Fixes #27

As @vslinuxdotnet discovered, sometimes the Pico firmware update emulated USB
stick does not get automounted under Linux.  Add logic to attempt to use
standard tools to mount it to the uploader, only tried if no drives are
detected normally.

Miscellaneous CI checks for code style, boards.txt update, and that all
referenced packages are available.

* Add Arduino examples to CI
* Remove bad example sketches

Stolen from ESP8266, modified to run basic sanity compiles on the core.

Fix warnings identified by the new checks.

As mentioned in https://github.com/earlephilhower/arduino-pico/discussions/156#discussion-3376456

* add missing character for debug level "Wire"

if Debug Level "Wire" is chosen, the compiler posts error
> arm-none-eabi-g++: error: DDEBUG_RP2040_WIRE: No such file or directory

Add the missing '-' to correct the issue.

* change must be made via makeboards.py

The generator script needs to be fixed and rerun. If we just update the boards.txt, changes will be lost on a rebuild.

* Update boards.txt

boards.txt as generated by revised makeboards.py

* correct spelling issue for CI tool

Fixes #95

Removed needed header from main.cpp during prior cleanup.  Re-add.

Fixes #146