Template:Infobox ship characteristics/paramline

For internal use by  :
 * First parameter: infobox line label
 * Second parameter: optional value for parameter
 * if absent and no WD parameter: line is not displayed
 * if absent and WD parameter: Wikidata is used to provide a value
 * if "none": line is not displayed
 * WD= optional Wikidata property (e.g. "ship class" or "P289")