added PassengerTypes to rules

OpenRa.Game/GameRules/UnitInfo.cs

@@ -57,6 +57,7 @@ namespace OpenRa.Game.GameRules
 		public readonly int[] SelectionSize = null;
 		public readonly int Passengers = 0;
 		public readonly int UnloadFacing = 0;
+		public readonly UnitMovementType[] PassengerTypes = null;
 
 		public UnitInfo(string name) { Name = name; }
 	}

OpenRa.Game/TerrainCosts.cs

@@ -2,7 +2,7 @@ using OpenRa.Game.Graphics;
 
 namespace OpenRa.Game
 {
-	enum UnitMovementType : byte
+	public enum UnitMovementType : byte
 	{
 		Foot = 0,
 		Track = 1,