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All the other platform bundled libraries use `KEYWORD1` for the library's global instance so this provides consistency.

Use authenticated API requests in "Compile Examples" CI workflow

The arduino/compile-sketches GitHub Actions action used in the "Compile Examples" workflow queries the GitHub API for the base ref of the pull request, which is used for the memory deltas determination.

There were a couple workflow runs recently (1, 2) that failed due to rate limiting. Authenticated API requests are given a more generous API request allowance, so providing the action with the automatically generated GitHub access token should prevent this from happening again.

Instruct the compiler to generate a map file during the compilation

Instruct the compiler to generate a map file during the compilation process which is sometimes useful for debugging.

Changing return type of 'requestFrom' from uint8_t to size_t allows the function to return the correct amount of bytes read (since internally it's already a size_t which is downcast to a uint8_t upon returning it. (#92)

Bugfix: wrong default I2C baud rate was set for Arduino Nano Every

This reverts commit d316aa62 to allow running CI tests on a known baseline

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The Google Code URL in boards.txt is very outdated.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.

Show correct compiler error message in UART0.cpp

Add CI workflows

Cross checked with the files UART1 to UART3, only UART0 needs the fix.