Added methode to hide trail

BauSystem_Main/src/de/steamwar/bausystem/features/tracer2/Trace.java

@@ -122,5 +122,14 @@ public class Trace {
         return new LinkedList<>(entitiesRecords.values());
     }
 
+    /** Hides this trail for the given player
+     *
+     * @param player
+     */
+    public void hide(Player player){
+        REntityServer server = serverMap.get(player);
+        if(server == null) return;
 
+        server.close();
+    }
 }