moved randoms onto World (reqd for side-by-side worlds, also fixes some obscure desyncs)

OpenRa.Game/World.cs

@@ -16,6 +16,9 @@ namespace OpenRa
 		List<IEffect> effects = new List<IEffect>();
 		List<Action<World>> frameEndActions = new List<Action<World>>();
 
+		public Random SharedRandom = new Random(0);	// synced
+		public Random CosmeticRandom = new Random();	// not synced
+
 		public readonly Dictionary<int, Player> players = new Dictionary<int, Player>();
 
 		int localPlayerIndex;