Logs should be available on stderr and format should be configurable

For docker or systemd deployments the log should not be put in files put send to stderr, as these platforms have their own log management. For log aggregation from multiple services it would be very nice to have a json based log format available. Currently one can configire via the console logger to log to stderr, but even if color is turned off some log messages contain color escapes. This is very confusing when viewing logs via some log aggregation service.