Read YAML configuration file
In today's webinar on configuring custom options, a participant asked whether we could enable configuration in YAML instead of JSON. Carsten revealed that he uses a YAML <-> JSON translator so he can work in YAML but still feed Kea JSON. It was suggested that maybe we could make Kea recognize whether the configuration file is in YAML or JSON, and in case of YAML, run this translator first. It seems like there might be a useful usability improvement in here somewhere.