DFM17 temperature/humidity measurement

[robots]

This is not a issue :)

I have created firmware that measures temperature and humidity using original method. If someone is interested:

https://github.com/robots/radiosonde_dfm17

Most of the work is not directly compatible with RS41ng firmware, it uses timers that this firmware uses internally. So if someone wants to use it in RS41ng it would require major refactor.