Add hasStarted to prevent multiple personal servers

src/de/steamwar/bungeecore/Subserver.java

@@ -39,6 +39,7 @@ import java.util.concurrent.TimeUnit;
 import java.util.logging.Level;
 import java.util.logging.Logger;
 
+@SuppressWarnings("deprecation")
 public class Subserver implements Runnable {
 
     private static final List<Subserver> serverList = new LinkedList<>();
@@ -110,6 +111,10 @@ public class Subserver implements Runnable {
         return tablistNames;
     }
 
+    public boolean hasStarted(){
+        return started;
+    }
+
     public void sendPlayer(ProxiedPlayer p){
         if(!started){
             p.sendMessage(Persistent.getPrefix() + "§7Der Server wird gestartet, einen Moment bitte...");