Restore custom background function, fix clockbg usage, restore img linked in readme

apps/boxclk/ChangeLog

@@ -3,4 +3,5 @@
 0.03: Allows showing the month in short or long format by setting `"shortMonth"` to true or false
 0.04: Improves touchscreen drag handling for background apps such as Pattern Launcher
 0.05: Fixes step count not resetting after a new day starts
-0.06  Added clockbackground app functionality
+0.06: Added clockbackground app functionality
+0.07: Allow custom backgrounds per boxclk config and from the clockbg module

apps/boxclk/app.js

@@ -10,6 +10,7 @@
   let locale = require("locale");
   let widgets = require("widget_utils");
   let date = new Date();
+  let bgImage;
   let configNumber = (storage.readJSON("boxclk.json", 1) || {}).selectedConfig || 0;
   let fileName = 'boxclk' + (configNumber > 0 ? `-${configNumber}` : '') + '.json';
   // Add a condition to check if the file exists, if it does not, default to 'boxclk.json'
@@ -71,6 +72,14 @@
   * ---------------------------------------------------------------
   */
 
+  for (let key in boxesConfig) {
+    if (key === 'bg' && boxesConfig[key].img) {
+      bgImage = storage.read(boxesConfig[key].img);
+    } else if (key !== 'selectedConfig') {
+      boxes[key] = Object.assign({}, boxesConfig[key]);
+    }
+  }
+
   let boxKeys = Object.keys(boxes);
 
   boxKeys.forEach((key) => {
@@ -211,14 +220,21 @@
   */
 
   let draw = (function() {
-    let updatePerMinute = true; // variable to track the state of time display
+    let updatePerMinute = true;
 
     return function(boxes) {
       date = new Date();
       g.clear();
-      background.fillRect(Bangle.appRect);
+
+      // Always draw background for full screen
+      if (bgImage) {
+        g.drawImage(bgImage, 0, 0);
+      } else {
+        background.fillRect(0, 0, g.getWidth(), g.getHeight());
+      }
+      
       if (boxes.time) {
-        boxes.time.string = modString(boxes.time, locale.time(date, isBool(boxes.time.short, true) ? 1 : 0));
+        boxes.time.string = modString(boxes.time, locale.time(date, isBool(boxes.time.short, true) ? 1 : 0).trim());
         updatePerMinute = isBool(boxes.time.short, true);
       }
       if (boxes.meridian) {