Add map actions as edit option

[acarroll51]

The soon-to-be-published refugees story map provides a good case study for why map actions will be useful in Map Series.

The "Migration into Europe" tab displays a schematic map of migration routes and barriers. I would have liked to put a narrative into the side panel with links to popups and/or features in the map. But without map actions users will have to click on each map element for information. It's tedious and unnecessary.

Let's please include map actions! It will make Series more consistent with Journal as well.