Fix cargo loading/unloading.

- Fix the unloading subcell bug, letting us have units move to directly adjacent cells.
- Have the cursor change to a deploy-blocked cursor if the transport can't unload due to terrain type.
- Add RenderTransport for transport door opening.
- Remove turning/opening in general.

OpenRA.Mods.RA/Render/RenderLandingCraft.cs

@@ -0,0 +1,81 @@
+#region Copyright & License Information
+/*
+ * Copyright 2007-2014 The OpenRA Developers (see AUTHORS)
+ * This file is part of OpenRA, which is free software. It is made
+ * available to you under the terms of the GNU General Public License
+ * as published by the Free Software Foundation. For more information,
+ * see COPYING.
+ */
+#endregion
+
+using System.Linq;
+using OpenRA.Traits;
+
+namespace OpenRA.Mods.RA.Render
+{
+	public class RenderLandingCraftInfo : RenderUnitInfo
+	{
+		public readonly string[] OpenTerrainTypes = { "Clear" };
+		public readonly string OpenAnim = "open";
+		public readonly string UnloadAnim = "unload";
+
+		public override object Create(ActorInitializer init) { return new RenderLandingCraft(init.self, this); }
+	}
+
+	public class RenderLandingCraft : RenderUnit
+	{
+		readonly Actor self;
+		readonly Cargo cargo;
+		readonly RenderLandingCraftInfo info;
+		bool open;
+
+		public RenderLandingCraft(Actor self, RenderLandingCraftInfo info)
+			: base(self)
+		{
+			this.self = self;
+			cargo = self.Trait<Cargo>();
+			this.info = info;
+		}
+
+		public bool ShouldBeOpen()
+		{
+			if (self.CenterPosition.Z > 0)
+				return false;
+
+			return cargo.CurrentAdjacentCells
+				.Any(c => info.OpenTerrainTypes.Contains(self.World.GetTerrainType(c)));
+		}
+
+		void Open()
+		{
+			if (open || !anim.HasSequence(info.OpenAnim))
+				return;
+
+			open = true;
+			PlayCustomAnimation(self, info.OpenAnim, () =>
+			{
+				if (anim.HasSequence(info.UnloadAnim))
+					PlayCustomAnimRepeating(self, info.UnloadAnim);
+			});
+		}
+
+		void Close()
+		{
+			if (!open || !anim.HasSequence(info.OpenAnim))
+				return;
+
+			open = false;
+			PlayCustomAnimBackwards(self, info.OpenAnim, null);
+		}
+
+		public override void Tick(Actor self)
+		{
+			if (ShouldBeOpen())
+				Open();
+			else
+				Close();
+
+			base.Tick(self);
+		}
+	}
+}