Should fix the race xml issues where boats get unassigned sometimes.

This removes the static raceServer stuff.
The Race/Boat/Regatta XML commands only execute if they contain newer data (it checks the sequence number).

racevisionGame/src/main/java/mock/model/RaceServer.java

@@ -24,7 +24,6 @@ import java.util.logging.Logger;
 public class RaceServer {
     private MockRace race;
     private LatestMessages latestMessages;
-    private static RaceServer server;
     private List<YachtEvent> collisionEvents = new ArrayList<>();
 
 
@@ -50,16 +49,10 @@ public class RaceServer {
 
 
     public RaceServer(MockRace race, LatestMessages latestMessages) {
-        server = this;
         this.race = race;
         this.latestMessages = latestMessages;
     }
 
-    public static void staticUpdateXML() {
-        if (server != null) {
-            server.updateXMLFiles();
-        }
-    }
 
     /**
      * Parses the race to create a snapshot, and places it in latestMessages.