Replace jquery usage with native functions

javascripts/core/playfab.js

@@ -68,7 +68,7 @@ function saveToPlayFab(root) {
     TitleId: titleId,
     PlayFabId: playFabId,
     // convert array into object with numbers as keys
-    Data: $.extend({}, chunks)
+    Data: chunks.mapToObject((_, index) => index, value => value)
   }
   try {
     PlayFab.ClientApi.UpdateUserData(requestData, saveToPlayFabCallback);

javascripts/game.js

@@ -218,11 +218,13 @@ function gainedInfinities() {
 
 setInterval(() => {
   if (isLocalEnvironment()) return;
-  $.getJSON("version.txt", data => {
-    if (data.version > player.version) {
-      Modal.message.show(data.message, updateRefresh);
-    }
-  });
+  fetch("version.txt")
+    .then(response => response.json())
+    .then(json => {
+      if (json.version > player.version) {
+        Modal.message.show(json.message, updateRefresh);
+      }
+    });
 }, 60000);
 
 // TODO: remove before release