Added media, menu, network and power modules to bar.

modules/bar/power/index.js

@@ -0,0 +1,13 @@
+export const Power = () => {
+  return {
+    component: Widget.Box({
+      child: Widget.Button({
+        child: Widget.Label({
+          class_name: "bar-power_label",
+          label: "⏻",
+        }),
+      }),
+    }),
+    isVisible: true,
+  };
+};