powermanager - Adds setting for widget

apps/powermanager/settings.js

@@ -24,6 +24,12 @@
       'title': 'Power Manager'
     },
     "< Back" : back,
+    'Show widget': {
+      value: !!settings.widget,
+      onchange: v => {
+        writeSettings("widget", v);
+      }
+    },
     'Monotonic percentage': {
       value: !!settings.forceMonoPercentage,
       onchange: v => {

apps/powermanager/widget.js

@@ -1,6 +1,10 @@
 /* run widgets in their own function scope so they don't interfere with
 currently-running apps */
 (() => {
+  const s = require("Storage").readJSON("powermanager.json") || {};
+  
+  if (!s.widget) return;
+
   const GU = require("graphics_utils");
   const APPROX_IDLE = 0.3;
   const APPROX_HIGH_BW_BLE = 0.5;