Refactor creation of Gui and AI lobby players into GamePlayerUtil

Fix so gui player name updated
Fix so multiple human players receive separate LobbyPlayerHuman instances

forge-core/src/main/java/forge/LobbyPlayer.java

@@ -1,5 +1,7 @@
 package forge;
 
+import org.apache.commons.lang3.StringUtils;
+
 /** 
  * This means a player's part unchanged for all games.
  * 
@@ -7,11 +9,9 @@ package forge;
  *
  */
 public abstract class LobbyPlayer {
-    
-    protected final String name;
+    protected String name;
     private int avatarIndex = -1;
 
-
     public LobbyPlayer(String name) {
         this.name = name;
     }
@@ -19,6 +19,10 @@ public abstract class LobbyPlayer {
     public String getName() {
         return name;
     }
+    public void setName(String name0) {
+        if (StringUtils.isEmpty(name0)) { return; } //don't allow setting name to nothing
+        name = name0;
+    }
 
     @Override
     public int hashCode() {