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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

Use same board.txt format as other Adafruit boards.
Add in quick note about the new USB stack to the docs.

* add adafruit qtpy and itsybitsy rp2040
* change qtpy boot2 to generic_03h_4

* initial tinyusb lib port

* add Adafruit_TinyUSB_Arduino as submodules

* add yield() to main loop

* sync with tinyusb lib latest

* add USB manufacturer and product

* fix typo in tinyusb lib

* sync with master

updating implementation

* Rationalize link stage command line

Make the build process less insane.

* clean up delay

* clean up platform and board

* update makeboards.py for generating usbstack menu

* update tinyusb lib to 1.0.0

Add definitions for compatibility to many platforms and libraries
- clockCyclesPerMicrosecond()
- clockCyclesToMicroseconds(a)
- microsecondsToClockCycles(a)

Add -DBOARD_NAME="{build.board}" to Compile patterns to facilitate using BOARD_NAME in sketches

Was required before due to C++ internals, but is not needed anymore thanks
to #137

Older builds included C++ locale information in RAM/flash as well as a
bunch of exception code which can't get called since they're not enabled.

Remove them by adjusting final link command and not instantiating them
in main.cpp in the first place.

Blink went from:
> Sketch uses 215604 bytes (10%) of program storage space. Maximum is 2093056 bytes.
> Global variables use 18152 bytes (6%) of dynamic memory, leaving 243992 bytes for local variables. Maximum is 262144 bytes.

To:
> Sketch uses 56112 bytes (5%) of program storage space. Maximum is 1044480 bytes.
> Global variables use 12152 bytes (4%) of dynamic memory, leaving 249992 bytes for local variables. Maximum is 262144 bytes.

For a savings of **155KB of flash** and **6KB of RAM**

Should fix #134 .  The SPI pin macros were set using the SPI1 set, not
the SPI0 set of pins it should have been using.