More energy units support #85
Description
Include more energy units, some of the most used ones from here: https://en.wikipedia.org/wiki/Units_of_energy - calories, BTU, eV, ft lb, erg, Wh
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Include more energy units, some of the most used ones from here: https://en.wikipedia.org/wiki/Units_of_energy - calories, BTU, eV, ft lb, erg, Wh