Notification system in frontend

- Heatmap worker now reports progress
- Base for new altitude value
- Phones can be marked active

android/app/src/main/java/de/nicolasklier/livebeat/TrackerService.kt

@@ -92,7 +92,10 @@ class TrackerService : Service() {
                     level * 100 / scale.toFloat()
                 }
 
-                val beat = Beat(androidId, arrayOf(location.latitude, location.longitude, location.accuracy.toDouble(), location.speed.toDouble()), batteryPct?.toInt(), location.time)
+                val beat = Beat(
+                        androidId,
+                        arrayOf(location.latitude, location.longitude, location.altitude, location.accuracy.toDouble(), location.speed.toDouble()),
+                        batteryPct?.toInt(), location.time)
                 val moshi = Moshi.Builder().add(KotlinJsonAdapterFactory()).build()
                 val jsonAdapter: JsonAdapter<Beat> = moshi.adapter(Beat::class.java)