made trackpoints cap at 50. This fixes fps issues with the minimap. #fix #story[1295]

racevisionGame/src/main/java/visualiser/model/VisualiserBoat.java

@@ -137,6 +137,9 @@ public class VisualiserBoat extends Boat {
             //Update the nextValidTime for the next track point.
             nextValidTime = currentTimeMilli + trackPointTimeInterval;
 
+            if (track.size() > trackPointLimit) {
+                track.remove(0);
+            }
         }
     }