Refine tracks

This includes drawing custom and labeling custom lines with JOSM, which
this commit introduces, and adding a style function to display them
differently on the map. Per Eric's feedback, I also adjusted the weight
of the lines at different zoom levels so they're not overpowering at
lower zoom levels.

map.html

@@ -280,11 +280,22 @@
                 }
             }
 
-            L.geoJSON(track, {
+            const trackLayer = L.geoJSON(track).addTo(map);
-                style: {
+            window.trackLayer = trackLayer;
-                    color: "maroon",
+            map.on('zoomend', function() {
-                },
+                trackLayer.setStyle(function (feature) { // zoom 15 - 21
-            }).addTo(map);
+                    switch (feature.properties.type) {
+                    case 'road':
+                        return { color: '#654321', weight: (map.getZoom() - 13) * 2 };
+                    case 'trail':
+                        return { color: 'maroon', weight: (map.getZoom() - 14) / 2 + 1 };
+                    case 'shooting_lane':
+                        return { color: 'black', weight: Math.max((map.getZoom() - 16), 1), dashArray: '8,12' };
+                    default:
+                        console.log("Unknown trail type: " + feature.properties.trail_type);
+                    }
+                });
+            });
 
             for (let stand of data.stands) {
                 if (stand.location) {