Optimize background Workers, remove redundant JobServices

1. Adapt the location callback in WeatherWorker to coroutines
2. Merge EventListenerJob into UpdateCalendarWorker
3. Remove BatteryListenerJob, as it's impossible to use Jobs to detect battery status

app/src/main/java/com/tommasoberlose/anotherwidget/receivers/WeatherReceiver.kt

@@ -42,12 +42,12 @@ class WeatherReceiver : BroadcastReceiver() {
                     5 -> 60L * 24
                     else -> 60
                 }
-                WeatherWorker.enqueue(context, interval, TimeUnit.MINUTES)
+                WeatherWorker.enqueuePeriodic(context, interval, TimeUnit.MINUTES)
             }
         }
 
         fun removeUpdates(context: Context) {
-            WeatherWorker.cancel(context)
+            WeatherWorker.cancelPeriodic(context)
         }
     }
 }