Added building keys to heliport and platform, and separated crane from platform edge.
Adding address and is_in=North Sea
Testing Sealand with place=town for rendering conflicts
Reverting to man_made=pier for display purposes.
Added crane and marked platform as seamark platform object
Removing pier designation as the structure is not connected to land.
Transferring tags from structure to POI marker.
Adjusting building to account for construction, fixing heliport shape.
Separated heliport from building on which it rests.
Adding citizenry count as population
Adding Sealand as a place:country. removing place:locality as it does not apply to a populated area.