Include diplomatic representation's operator, and whether it is an embassy or consulate

[nicolas-raoul]

This is phase 2 following Dario's great work at #23.

The operator of the USA consulate in Frankfurt is the USA.

In the English Wikivoyage it is in the "Embassies" section, so we know that it is a consulate: https://en.wikivoyage.org/wiki/Frankfurt#Cope

We should add an "operator" property to Listing.java and accordingly a column in the CSV.
Also, when we know whether a diplomatic-representation is a embassy or consulate, we should set the listing type to "embassy" or "consulate". When we don't know, "diplomatic-representation" is fine.

Other examples: https://en.wikivoyage.org/wiki/Lyon https://en.wikivoyage.org/wiki/Paris

Some Wikivoyages seem to not make the difference: https://fr.wikivoyage.org/wiki/Lyon#Repr.C3.A9sentations_diplomatiques