(svn r7505) -Feature: show NewGRFs used on a game server, show which NewGRFs you do and do not have.

-Feature: show NewGRF compatability of network games in the Game List window; a green square if you got the same OpenTTD version and have the needed NewGRF, a red square if the version does not match and a yellow square if the version matches, but the client is missing at least one of the NewGRFs.

network_gamelist.c

@@ -5,6 +5,7 @@
 #include "stdafx.h"
 #include "debug.h"
 #include "network_data.h"
+#include "newgrf_config.h"
 
 // This file handles the GameList
 // Also, it handles the request to a server for data about the server
@@ -57,6 +58,9 @@ void NetworkGameListRemoveItem(NetworkGameList *remove)
 				prev_item->next = remove->next;
 			}
 
+			/* Remove GRFConfig information */
+			ClearGRFConfigList(remove->info.grfconfig);
+
 			free(remove);
 			DEBUG(net, 4) ("[NET][GameList] Removed server from list");
 			UpdateNetworkGameWindow(false);