I find the `zone_code` and `zone_name` variables a bit confusing overall, it makes sense when we are dealing with LCZ, but a bit confusing if we are talking about building categories etc.

[sahandv]

          I find the `zone_code` and `zone_name` variables a bit confusing overall, it makes sense when we are dealing with LCZ, but a bit confusing if we are talking about building categories etc.

Originally posted by @xinwei89 in #15 (review)