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Fix #39

Fix #40

The conversion is required for GOOS=windows

Fix #31

See #6

Fix #6

It may be available a bundle AVR core withing the Arduino IDE, if the
user installs a specific version (even an earlier version than the
bundled) then the installed core should be used.

See #28

This prevents the CLI from crashing as reported in #28

Apply style 2 in the flags (a line break before the description) https://github.com/arduino/arduino-cli/pull/24#discussion_r213709753