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Updated board names

Updated some board names to the proper spelling 

@facchinm

Fix misspelled words in comments

This project uses the codespell tool used to check for commonly misspelled words in the files of the repository.

A recent update to the tool's misspelled words dictionary resulted in the identification of some occurrences of a
misspelled word in the comments.

In addition to correcting the detected misspellings, I did a quick scan over the repository and identified a few
additional misspellings to correct.

Use correct quoting for paths in post_install.bat

In the latest release of the codespell tool used for automated spell checking of the files of this project, the word "clen" was added to the codespell misspelled words dictionary as a misspelling of "clean".

This caused a false detection of a struct member name `clen` as a misspelling, resulting in a failing spell check result. Since the occurrence of this name is correct and intended in this project, the false positive is resolved by configuring codespell to ignore the problematic word.

Fix missing word in keywords.txt

Use established KEYWORD_TOKENTYPE for Wire keyword

Bump actions/upload-artifact from 2 to 3

Bumps [actions/upload-artifact](https://github.com/actions/upload-artifact) from 2 to 3.
- [Release notes](https://github.com/actions/upload-artifact/releases)
- [Commits](https://github.com/actions/upload-artifact/compare/v2...v3)

---
updated-dependencies:
- dependency-name: actions/upload-artifact
  dependency-type: direct:production
  update-type: version-update:semver-major
...
Signed-off-by: dependabot[bot] <support@github.com>

Bump actions/checkout from 2 to 3

Bumps [actions/checkout](https://github.com/actions/checkout) from 2 to 3.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](https://github.com/actions/checkout/compare/v2...v3)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-type: direct:production
  update-type: version-update:semver-major
...
Signed-off-by: dependabot[bot] <support@github.com>

Use more logical Boards menu placement for Uno Mini

Arduino has added a new board to the AVR-based line: the Uno Mini. The Uno Mini has its own board definition in this
platform, which produces a dedicated item in the **Tools > Board** menu of the Arduino IDE.

The classic Arduino IDE arranges the Boards menu for each platform according to the order of occurrence of the board
definition in the platform's boards.txt configuration file. The previous placement of the Uno Mini board definition
resulted in the board appearing at the end of the menu, along with retired and 3rd party boards.

The new placement will cause it to be shown alongside the related Arduino Uno and in a position befitting the latest
official AVR board.

Add unomini to sketch compilation CI workflow

The "Compile Examples" GitHub Actions workflow provides a basic "smoke test" for the platform by compiling the relevant example sketches for each of the boards on every commit and pull request.

A new board has been added to the platform (Uno Mini) and so should be added to the list of boards compiled for in this workflow.

Even though the Uno compilation does provide reasonable coverage for the Uno Mini due to their similar configurations, that coverage does not extend to the board definition itself.

Add drivers originally bundled with Java IDE directly in the core

modify post_install.bat according to https://github.com/arduino/ArduinoCore-megaavr/blob/master/post_install.bat

initial import from https://github.com/arduino/Arduino/tree/master/build/windows/dist/drivers (moved also gemma stuff under `gemma/`)

Fix legacy `upload.network_pattern` rule

Add support for pluggable discovery

Speed up 'available' method by inserting unsigned int cast

Allow disabling CDC with -DCDC_DISABLED

Don't use codespell's "rare" dictionary for CI spell check

The word "statics" was recently added to codespell's "rare" commonly mispelled words directory. By default, this
dictionary is used in addition to the more conservative "clear" dictionary, resulting in a spurious failure of the
"Spell Check" CI workflow.

Although this could be fixed by adding the word to the ignore list, it seems that an increasing number of common words
being added to this dictionary, so I think it's best to just remove it altogether. The goal for the "Spell Check"
workflow is to catch some typos without a significant number of false positives, even if that means some misspellings
slip through. I think the "clear" dictionary is more in line with that goal.

Use GitHub Actions for continuous integration

On creation or commit to a pull request, a report of the resulting change in memory usage of the examples will be
commented to the PR thread.

On every push or pull request that affects platform source code or bundled libraries, compile example
sketches of all bundled libraries for the platform's boards.

On every push, pull request, and periodically, run Arduino Lint to check for common problems not related to the project
code.