Allow to use emoji's as icons, fix #1997

src/Utils.ts

@@ -1659,4 +1659,14 @@ In the case that MapComplete is pointed to the testing grounds, the edit will be
             }
         }
     }
+
+        private static emojiRegex  = /^\p{Extended_Pictographic}+$/u
+
+    /**
+     * Returns 'true' if the given string contains at least one and only emoji characters
+     * @param string
+     */
+    public static isEmoji(string: string){
+        return Utils.emojiRegex.test(string)
+    }
 }