Mod version validation

- Game.CurrentMods property to query the current mods when no orderManager accessible
- Server sends mod versions to master server on ping
- Client sends mod versions on handshake response
- Validate match on server side of handshake, not client side

OpenRA.Mods.RA/ServerTraits/MasterServerPinger.cs

@@ -13,13 +13,14 @@ using System.Collections.Generic;
 using System.Net;
 using OpenRA.Server;
 using S = OpenRA.Server.Server;
+using System.Linq;
 
 namespace OpenRA.Mods.RA.Server
 {
 	public class MasterServerPinger : ServerTrait, ITick, INotifySyncLobbyInfo, IStartGame
 	{
 		const int MasterPingInterval = 60 * 3;	// 3 minutes. server has a 5 minute TTL for games, so give ourselves a bit
-		// of leeway.
+												// of leeway.
 		public int TickTimeout { get { return MasterPingInterval * 10000; } }
 		public void Tick(S server)
 		{
@@ -29,10 +30,10 @@ namespace OpenRA.Mods.RA.Server
 				lock (masterServerMessages)
 					while (masterServerMessages.Count > 0)
 						server.SendChat(null, masterServerMessages.Dequeue());
-
+			
 		}
-
-
+		
+		
 		public void LobbyInfoSynced(S server) { PingMasterServer(server); }
 		public void GameStarted(S server) { PingMasterServer(server); }
 
@@ -42,7 +43,7 @@ namespace OpenRA.Mods.RA.Server
 		static string masterServerUrl = Game.Settings.Server.MasterServer;
 		static int externalPort = Game.Settings.Server.ExternalPort;
 		static bool isInitialPing = true;
-
+		
 		static volatile bool isBusy;
 		static Queue<string> masterServerMessages = new Queue<string>();
 		public static void PingMasterServer(S server)
@@ -62,13 +63,13 @@ namespace OpenRA.Mods.RA.Server
 						using (var wc = new WebClient())
 						{
 							wc.Proxy = null;
-							wc.DownloadData(
-							   masterServerUrl + url.F(
-							   externalPort, Uri.EscapeUriString(server.Name),
-							   server.GameStarted ? 2 : 1,	// todo: post-game states, etc.
-							   server.lobbyInfo.Clients.Count,
-							   string.Join(",", server.lobbyInfo.GlobalSettings.Mods),
-							   server.lobbyInfo.GlobalSettings.Map));
+							 wc.DownloadData(
+								masterServerUrl + url.F(
+								externalPort, Uri.EscapeUriString(server.Name),
+								server.GameStarted ? 2 : 1,	// todo: post-game states, etc.
+								server.lobbyInfo.Clients.Count,
+								string.Join(",", Game.CurrentMods.Select(f => "{0}@{1}".F(f.Key, f.Value.Version)).ToArray()),
+								server.lobbyInfo.GlobalSettings.Map));
 
 							if (isInitialPing)
 							{
@@ -78,11 +79,11 @@ namespace OpenRA.Mods.RA.Server
 							}
 						}
 					}
-					catch (Exception ex)
+					catch(Exception ex)
 					{
 						Log.Write("server", ex.ToString());
-						lock (masterServerMessages)
-							masterServerMessages.Enqueue("Master server communication failed.");
+						lock( masterServerMessages )
+							masterServerMessages.Enqueue( "Master server communication failed." );
 					}
 
 					isBusy = false;