line
fun FeatureBuilder<Gmc>.line(curve: GmcCurve, id: String? = null): FeatureRef<Gmc, LineFeature<Gmc>>
fun FeatureBuilder<Gmc>.line(aCoordinates: Pair<Double, Double>, bCoordinates: Pair<Double, Double>, id: String? = null): FeatureRef<Gmc, LineFeature<Gmc>>