Add 'steal' as special rendering, update 'multi', add entrance overview to onwheels layer

assets/themes/indoors/indoors.json

@@ -17,6 +17,12 @@
   "startZoom": 14,
   "widenFactor": 2,
   "layers": [
-    "indoors"
+    "indoors",
+    {
+      "builtin": ["walls_and_buildings"],
+      "override": {
+        "shownByDefault": true
+      }
+    }
   ]
 }