* Added new channel parameter tariff to channels instantpower, totalusage, currentFlow, cumulativeValue, counter and currentNumber
* Parameter is currently just read by EEP A5_12, which is used by AutomatedMeterSensor ThingType
* AutomatedMeterSensor ThingType has extensible channels now
Fixes#9333
Signed-off-by: Daniel Weber <uni@fruggy.de>