Update src and add more testing

[adrian-soch]

• Update src code
• Update unit tests
• Add Arduino example code
• adapt code for linux and arduino
• Move refs folder into docs
• Add example c++ usage
• Fix/update cmake files
• format some .tex files
• general cleanup and formatting

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

❗ No coverage uploaded for pull request base (main@9521abb). Click here to learn what that means.

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Additional details and impacted files

@@           Coverage Diff           @@
##             main      #66   +/-   ##
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  Coverage        ?   97.48%           
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  Files           ?       10           
  Lines           ?      397           
  Branches        ?       12           
=======================================
  Hits            ?      387           
  Misses          ?        8           
  Partials        ?        2           

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