Cadence set to 0 when connected but user is not pedaling. Fixes #931.

Speed set to 0 when connected but last value is outdated. Fixes #930.
Bug: overflow when reset sensors (cadence and speed). Fixes #833.
Moving time stops when is not moving (the last track point is not moving) and restarts when last track point is moving.

src/main/java/de/dennisguse/opentracks/stats/TrackStatisticsUpdater.java

@@ -178,7 +178,9 @@ public class TrackStatisticsUpdater {
         }
 
         // Update moving time
-        currentSegment.addMovingTime(movingTime);
+        if (lastTrackPoint.isMoving()) {
+            currentSegment.addMovingTime(movingTime);
+        }
 
         // Update max speed
         if (trackPoint.hasSpeed() && lastTrackPoint.hasSpeed()) {