Support classing of aerialway and piste, and adjust line widths

(closes #5843)

modules/svg/tag_classes.js

@@ -4,8 +4,8 @@ import { osmPavedTags } from '../osm/tags';
 
 export function svgTagClasses() {
     var primaries = [
-        'building', 'highway', 'railway', 'waterway', 'aeroway',
-        'motorway', 'boundary', 'power', 'amenity', 'natural', 'landuse',
+        'building', 'highway', 'railway', 'waterway', 'aeroway', 'aerialway',
+        'piste:type', 'boundary', 'power', 'amenity', 'natural', 'landuse',
         'leisure', 'military', 'place', 'man_made', 'route', 'attraction'
     ];
     var statuses = [
@@ -59,6 +59,10 @@ export function svgTagClasses() {
                 v = t[k];
                 if (!v || v === 'no') continue;
 
+                if (k === 'piste:type') {  // avoid a ':' in the class name
+                    k = 'piste';
+                }
+
                 primary = k;
                 if (statuses.indexOf(v) !== -1) {   // e.g. `railway=abandoned`
                     status = v;