Add amenity place types to GeocodePlace

The place types selected here are among the top of the amenity
category from http://taginfo.openstreetmap.org/keys/amenity#values

https://bugzilla.gnome.org/show_bug.cgi?id=725899
Add icons for new amenity place types

https://bugzilla.gnome.org/show_bug.cgi?id=725899
build: Add icon for airtport place type

https://bugzilla.gnome.org/show_bug.cgi?id=725899
forward: Include airport place type in results

https://bugzilla.gnome.org/show_bug.cgi?id=725899