Make outlink and outlinkTarget available for each feature

It was only for polygon until then.

cf #323

umap/static/umap/js/umap.features.js

@@ -173,6 +173,8 @@ L.U.FeatureMixin = {
       'properties._umap_options.showLabel',
       'properties._umap_options.labelDirection',
       'properties._umap_options.labelInteractive',
+      'properties._umap_options.outlink',
+      'properties._umap_options.outlinkTarget',
     ]
   },
 
@@ -1045,19 +1047,6 @@ L.U.Polygon = L.Polygon.extend({
           inheritable: true,
         },
       ],
-      [
-        'properties._umap_options.outlink',
-        {
-          label: L._('Link to…'),
-          helpEntries: 'outlink',
-          placeholder: 'http://...',
-          inheritable: true,
-        },
-      ],
-      [
-        'properties._umap_options.outlinkTarget',
-        { handler: 'OutlinkTarget', label: L._('Open link in…'), inheritable: true },
-      ],
     ]
     return options.concat(L.U.FeatureMixin.getInteractionOptions())
   },

umap/static/umap/js/umap.forms.js

@@ -1045,6 +1045,17 @@ L.U.FormBuilder = L.FormBuilder.extend({
       label: L._('Labels are clickable'),
       inheritable: true,
     },
+    outlink: {
+      label: L._('Link to…'),
+      helpEntries: 'outlink',
+      placeholder: 'http://...',
+      inheritable: true,
+    },
+    outlinkTarget: {
+      handler: 'OutlinkTarget',
+      label: L._('Open link in…'),
+      inheritable: true,
+    },
     labelKey: {
       helpEntries: 'labelKey',
       placeholder: L._('Default: name'),