Major Description
Properties objects were used elsewhere in Kafka, but the new clients have moved to regular maps (Map<String, Object> for most configs, but Map<String, String> makes sense for Copycat since the configs the maps are used for always have to be serializeable to .properties files). Since Properties objects are kind of annoying to deal with and we have a bunch of translations scattered throughout the Copycat code, it will be easier to use Maps and only resort to using the Properties class for parsing the .properties files.