Updated project to latest Arduino sketch specification#7

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snives wants to merge 3 commits intokahiroka:masterfrom snives:master

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Commits on Nov 17, 2021

- Renamed slcan.ino to slcanuino.ino to match the name of the project as required by the Arduino IDE.
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minor code cleanup
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Removed the requirement to move the Canbus folder to ~/Arduino/Libraries.
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