Check runways,aerodromes for missing tags in validator

[maxerickson@…]

They aren't well adapted for global use but the simple rules I use locally flag many easy improvements:

*[aeroway=aerodrome][!faa]{

group: tr("Airport Tagging");
throwWarning: tr("Airport without faa code.");

}

*[aeroway=helipad][!faa]{

group: tr("Airport Tagging");
throwWarning: tr("Helipad without faa code.");

}

*[aeroway=aerodrome][!icao][faa!~/\d/],
*[aeroway=aerodrome][!iata][faa!~/\d/]{

group: tr("Airport Tagging");
throwWarning: tr("Airport without {0} code.", "{1.key}");

}

*[aeroway=runway][!ref],
*[aeroway=runway][!surface]{

group: tr("Airport Tagging");
throwWarning: tr("Runway missing {0}.", "{1.key}");

}

The [faa!~/\d/] selector suppresses the warnings for small US airports, where the faa usually assigns an identifier that contains a number.