Replace localstorage with node_helper write to file

Seeing a bunch of weird issues with this data not saving through the
browser/electron, so let's just use a known-good method instead.

node_helper.js

@@ -0,0 +1,43 @@
+const NodeHelper = require("node_helper");
+const path = require("path");
+const fs = require("fs");
+const filename = "/saved.json";
+var configFilename = path.resolve(__dirname + filename);
+
+module.exports = NodeHelper.create({
+    start() {
+        console.log("##### Starting node helper for: " + this.name);
+
+        fs.readFile(configFilename, (err, data) => {
+            if (err) {
+                if (err.code === 'ENOENT') {
+                    return;
+                }
+
+                throw err;
+            }
+
+            this.saved_data = JSON.parse(data);
+        });
+    },
+
+    writeToFile(data) {
+        var json = JSON.stringify(data);
+        fs.writeFileSync(configFilename, json, "utf8");
+    },
+
+    socketNotificationReceived(notification, payload) {
+        if (notification === "CHORES_ADD_DATA") {
+            if (!this.saved_data) {
+                this.saved_data = {}
+            }
+
+            this.saved_data[payload.key] = payload.val
+            this.writeToFile(this.saved_data)
+        } else if (notification === "CHORES_READY") {
+            if (this.saved_data) {
+                this.sendSocketNotification("CHORES_DATA_READ", this.saved_data)
+            }
+        }
+    }
+});