removed use of js Set

src/misc.js

@@ -218,3 +218,14 @@ export function lineColor(buy, index) {
     return c.string()
 }
 
+
+export function unique(arr) {
+    const u = {}, a = [];
+    for(let i = 0, l = arr.length; i < l; ++i){
+        if(!u.hasOwnProperty(arr[i])) {
+            a.push(arr[i]);
+            u[arr[i]] = 1;
+        }
+    }
+    return a;
+}