Set the baseURL for ajax requests (#373)

* Set the baseURL for ajax requests

* Use async/await on AJAX calls

* Add mix_public() cache generated asset cache busting

* Move storage container into separate class

* Fix some styling

resources/js/storage.js

@@ -0,0 +1,77 @@
+'use strict';
+
+/**
+ * Simple browser storage interface
+ */
+export default class Storage {
+    constructor(name, default_value) {
+        this.name = name;
+
+        // Read the object from storage; if it doesn't exist, set
+        // it to the default value
+        const st = window.localStorage.getItem(this.name);
+        if (!st) {
+            console.log('Nothing found in storage, starting from default');
+            this.data = default_value;
+        } else {
+            console.log('Found in storage: ', st);
+            this.data = JSON.parse(st);
+        }
+    }
+
+    /**
+     * Save to local storage
+     */
+    save() {
+        window.localStorage.setItem(this.name, JSON.stringify(this.data));
+    }
+
+    /**
+     * Return a list from a given key
+     *
+     * @param {String} key
+     *
+     * @returns {Array|*}
+     */
+    getList(key) {
+        if (!(key in this.data)) {
+            return [];
+        }
+
+        return this.data[key];
+    }
+
+    /**
+     * Add `value` to a given `key`
+     *
+     * @param {string} key
+     * @param {*} value
+     */
+    addToList(key, value) {
+        if (!(key in this.data)) {
+            this.data[key] = [];
+        }
+
+        const index = this.data[key].indexOf(value);
+        if (index === -1) {
+            this.data[key].push(value);
+        }
+    }
+
+    /**
+     * Remove `value` from the given `key`
+     *
+     * @param {String} key
+     * @param {*} value
+     */
+    removeFromList(key, value) {
+        if (!(key in this.data)) {
+            return;
+        }
+
+        const index = this.data[key].indexOf(value);
+        if (index !== -1) {
+            this.data[key].splice(index, 1);
+        }
+    }
+}