Remove runtime mod merging. Closes #3421.

OpenRA.Game/Network/UnitOrders.cs

@@ -119,9 +119,14 @@ namespace OpenRA.Network
 				case "HandshakeRequest":
 					{
 						var request = HandshakeRequest.Deserialize(order.TargetString);
-						var localMods = orderManager.LobbyInfo.GlobalSettings.Mods.Select(m => "{0}@{1}".F(m, Mod.AllMods[m].Version)).ToArray();
+
+						// TODO: Switch to the server's mod if we have it
+						// Otherwise send the handshake with our current settings and let the server reject us
+						var mod = Game.modData.Manifest.Mod;
 
 						// Check that the map exists on the client
+						// TODO: This will behave badly if joining a server with a different mod
+						// This needs to occur *after* joining the server
 						if (!Game.modData.AvailableMaps.ContainsKey(request.Map))
 						{
 							if (Game.Settings.Game.AllowDownloading)
@@ -144,7 +149,8 @@ namespace OpenRA.Network
 						var response = new HandshakeResponse()
 						{
 							Client = info,
-							Mods = localMods,
+							Mod = mod.Id,
+							Version = mod.Version,
 							Password = orderManager.Password
 						};