Add IATA code as Airport label on zoom 12-14

[CharliePlett]

This adds the iata= and icao= as the airport label beside the icon on zoom levels 12 to 14.

[CharliePlett]

If this gets approved then the icao= and iata= would need to be added to the vtiles for this to take effect.

[erictheise]

This appears to drop the Airport icon entirely. Is that intentional?

I'm looking at SFO, https://localhost:8888/#13/37.62525/-122.38144, using our current version of staging and one to three airplanes appear from zoom ~10-14. I don't see any airplanes using your branch. I also don't see any IATA code; the only text that appears relates to taxiways and "San Francisco International Airport", and those begin to display at zoom 13.

Our staging branch:

Your staging branch:

[erictheise]

Seems exposing the data is still pending in OpenHistoricalMap/issues#1314

[CharliePlett]

I'm pretty sure the icon was showing when I created the pull request. Did something else change over time?

[erictheise]

I cloned your repo and am running your staging branch directly. I'd suspect that dropping

"icon-size": ["interpolate", ["linear"], ["zoom"], 10, 1.2, 14, 1.5],

is the cause.

[CharliePlett]

Can you fix it?

[CharliePlett]

I messed up and accidentally moved my latest cemeteries commit into this pull request.