WIP: Support for Huber chillers with ComGate interface

Implements support for Huber chillers with ComG@te interface. Note that this is a different interface hardware than what is dealt with in merge request 215. Documentation ca be found here: https://www.huber-online.com/download/manuals/archive/unistats_EN.pdf

Tested successfully in Goettingen on a Huber Unistat 705 with ComG@ate, connected via RS232.