Use item::energy to stash sub-kJ power quantities for more precise power usage · CleverRaven/Cataclysm-DDA@663ce38

method 'energy_per_second' can be made const [readability-make-member-function-const,-warnings-as-errors]

constructing energy quantity from 'const int' can overflow in 'from_kilojoule' in multiplying with the conversion factor [cata-unit-overflow,-warnings-as-errors]

Process completed with exit code 123.