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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.

On every push, pull request, and periodically, use the codespell-project/actions-codespell action to check for commonly
misspelled words.

In the event of a false positive, the problematic word should be added, in all lowercase, to the ignore-words-list field
of ./.codespellrc. Regardless of the case of the word in the false positive, it must be in all lowercase in the ignore
list. The ignore list is comma-separated with no spaces.

Dependabot will periodically check the versions of all actions used in the repository's workflows. If any are found to
be outdated, it will submit a pull request to update them.
NOTE: Dependabot's PRs will sometimes try to pin to the patch version of the action (e.g., updating `uses: foo/bar@v1`
to `uses: foo/bar@v2.3.4`). When the action author has provided a major version ref, use that instead
(e.g., `uses: foo/bar@v2`). Dependabot will automatically close its PR once the workflow has been updated.
More information:
https://docs.github.com/en/github/administering-a-repository/keeping-your-actions-up-to-date-with-dependabot

Declare TwoWire functions as virtual

To make alternative implementations of the TwoWire class (e.g. SoftwareWire for software I2C) work properly being passed to libraries that expect TwoWire type.

fix twi_manageTimeoutFlag function description

Sometimes Arduino-based USB devices don't work because some hardware
(like KVM switches) gets confused by the CDC sub-devices.
This change makes it relatively easy to disable CDC at compiletime.
Disabling it of course means that the serial console won't work anymore,
so you need to use the reset button when flashing.

CDC_DISABLED is also used in ArduinoCore-samd for the same purpose.

based on
https://github.com/gdsports/usb-metamorph/tree/master/USBSerPassThruLine

See also https://github.com/NicoHood/HID/issues/225 and
https://github.com/arduino/Arduino/issues/6387 and
https://forum.arduino.cc/index.php?topic=545288.msg3717028#msg3717028

Update platform specification URLs in configuration files

The Google Code URL in boards.txt is very outdated. The URL in platform.txt is to a more recent home of the content,
which has been replaced with a link to the new location, but while I'm updating boards.txt, I might as well point both
URLs to the real page.

Improve reading ADC result

7.3.0-atmel3.6.1-arduino7 gcc fails to optimize separate reading from ADCL and ADCH. It produces additionally three eor commands or in some cases two mov commands in the assembly code (see discussion #344). These commands swap register contents before store them to data area. So they are completely unnecessary. Reading ADC result with ADC macro fixes it and gcc generates the right code..

Improve and complete implementation of new/delete

The standard dictates that `std::size_t` is used, rather than the plain
`size_t` type.

Even though these types are usually, if not always, exactly the same
type, other code might assume that `std::size_t` is actually used and thus
also available under that name after including `<new>`.

This fixes that by using the right type. One challenge is that it is
usually declared in headers that we do not have available, so this just
defines the `std::size_t` type in the `<new>` header to work around
that.

This is currently disabled, keeping the old behavior of returning
NULL on failure, but should probably be enabled in the future as code
that does want to do a null check has had a chance to switch to the
more portable nothrow versions.

When enabled, allocation failure calls the weak `std::terminate()`,
which calls `abort()` by default, but can be replaced by user code to do
more specific handling.

To enable this, a macro must be defined (in new.cpp or on the compiler
commandline).

This fixes part of #287.