Add Geolocation Column to the Editorial Assets list

We'd love to see a Geolocation column added to the Editorial Assets window.

We'd like to switch from using location name-based Sections to actual Geolocations, however one disadvantage will be that we can't see which Geolocations an asset is tagged in without actually opening it.

This makes it hard for an editor to quickly at a glance ensure things are in the right place, like they can now with Sections, without even opening the assets.