✨ Adds refresh button to widget, for reloading data

src/mixins/WidgetMixin.js

@@ -1,10 +1,31 @@
+import LoadingAnimation from '@/assets/interface-icons/loader.svg';
+
 const WidgetMixin = {
+  components: {
+    LoadingAnimation,
+  },
   props: {
+    /* The options prop is an object of settings for a given widget */
     options: {
       type: Object,
       default: {},
     },
   },
+  data: () => ({
+    loading: true, // Indicates current loading status, to display spinner
+  }),
+  methods: {
+    /* Overridden by widget component. Re-fetches and renders any external data  *
+     * Called by parent component, and triggered either by user or time interval */
+    update() {
+      // eslint-disable-next-line no-console
+      console.log('No update method configured for this widget');
+    },
+  },
+  mounted() {
+    // If the mounted function isn't overridden,then hide loader
+    this.loading = false;
+  },
 };
 
 export default WidgetMixin;