Add sensor device classes 'voltage' and 'current'

Many of us are monitoring battery-operated devices via sensors, so may I suggest adding the following two new sensor device classes:

  • voltage, suggested units (default first): ‘V’, ‘mV’
  • current, suggested units (default first): ‘A’, ‘mA’, ‘µA’
    (if need arises, this could also be named ‘amperage’)

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