unsubscribe from competitors-for-race updates in those PlayerModes that don't need it

Change-Id: Ib0eabc33e29e0dbecfa4b86b2991d86aa8dc6a21

java/com.sap.sailing.gwt.ui/src/main/java/com/sap/sailing/gwt/ui/raceboard/AbstractRaceBoardMode.java

@@ -30,6 +30,8 @@ import com.sap.sse.gwt.client.player.Timer;
  * {@link #trigger} method each time (abstract in this class). Subclasses can and should do the following:
  * 
  * <ul>
+ * <li>Redefine {@link #applyTo(RaceBoardPanel)} and call the {@code stopReceiving...} methods for those types of
+ *     events they don't need</li>
  * <li>Redefine specific callback methods in case more processing is required or canceling the listener is desired only
  * when certain preconditions are met</li>
  * <li>Implement the {@link #trigger} method to check if all information required has been received by now and then use

java/com.sap.sailing.gwt.ui/src/main/java/com/sap/sailing/gwt/ui/raceboard/FullAnalysisMode.java

@@ -19,6 +19,12 @@ public class FullAnalysisMode extends AbstractRaceBoardMode {
     private boolean leaderboardSettingsAdjusted;
     private boolean timerAdjusted;
     
+    @Override
+    public void applyTo(RaceBoardPanel raceBoardPanel) {
+        super.applyTo(raceBoardPanel);
+        stopReceivingCompetitorsInRace();
+    }
+
     /**
      * Listening for race times info continues until information about the end of the race has been received. The leaderboard
      * settings are adjusted as soon as a valid leaderboard has been received.

java/com.sap.sailing.gwt.ui/src/main/java/com/sap/sailing/gwt/ui/raceboard/PlayerMode.java

@@ -24,6 +24,12 @@ public class PlayerMode extends AbstractRaceBoardMode {
 
     private boolean timerAdjusted;
     
+    @Override
+    public void applyTo(RaceBoardPanel raceBoardPanel) {
+        super.applyTo(raceBoardPanel);
+        stopReceivingCompetitorsInRace();
+    }
+
     private void adjustLeaderboardSettings() {
         final LeaderboardSettings existingSettings = getLeaderboardPanel().getSettings();
         final List<DetailType> raceDetailsToShow = new ArrayList<>(existingSettings.getRaceDetailsToShow());