Polyfill string.fromcodepoint for IE11/Phantom

modules/id.js

@@ -1,4 +1,5 @@
 import 'browser-polyfills';
+import 'string.fromcodepoint';
 import 'abortcontroller-polyfill/dist/polyfill-patch-fetch';
 
 // polyfill requestIdleCallback

package.json

@@ -53,6 +53,7 @@
     "pannellum": "2.4.1",
     "q": "1.5.1",
     "rbush": "2.0.2",
+    "string.fromcodepoint": "0.2.1",
     "which-polygon": "2.2.0",
     "wmf-sitematrix": "0.1.4"
   },