Client Geoip information logging

[jmwample]

Issue

PR #64 adds the ability to toggle client IP logging, where information is either included or excluded. It would be ideal to include more generic geoip information in the place of client IP addresses when client ip logging is disabled. This would require updates to the detector, station application, and registration api much like PR #64.

This would likely require each station to independently download the maxmind GeoLite2 City database.

potential rust geoip lib
potential golang geoip lib