Improve the Cargo Special:Drilldown page

The Cargo extension's Special:Drilldown page shows a listing of each table, its contents, and a set of filters, for all the data in a wiki stored via Cargo. This project aims to improve upon the current results of the Drilldown page (for instance, adding additional tabs to let users see the results in a map, or in a calendar or timeline) and to improve the implementation of the filters.