WIP: json for climate sensor

make ClimateSensors (at least analog versions) configurable via json files, ideally even creation of an arbitrary set of sensors defined via json

• 1st step: configure any of the parameters in analog ClimateSensors, such as NTCSensor, from json file, in particular the channel used on the ADCDevice
• 2nd step: dynamically create a set of ClimateSensor instances from a json file
• 3rd step: create a proper factory class for functionality: functionality of step 2, but creating interfaces properly (ADCDevice, but also others, e.g. I2C?)