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Fix #55

Fix #23

This commit fixes the text for the examples used when typing 'arduino-cli board attach' and 'arduino-cli board' as they shown the wrong commands (wrong AppName in the 'board attach' command, non-existing '--board' and '--sketch' arguments in 'board' command)

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