Move ClassicFacingFudge support to Mods.Cnc

This moves the TD/RA-specific re-mapping of sprite facings
and coordinates to Mods.Cnc.

OpenRA.Mods.Cnc/Graphics/ClassicSpriteSequence.cs

@@ -0,0 +1,50 @@
+#region Copyright & License Information
+/*
+ * Copyright 2007-2020 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, either version 3 of
+ * the License, or (at your option) any later version. For more
+ * information, see COPYING.
+ */
+#endregion
+
+using System;
+using OpenRA.Graphics;
+using OpenRA.Mods.Common.Graphics;
+
+namespace OpenRA.Mods.Cnc.Graphics
+{
+	public class ClassicSpriteSequenceLoader : DefaultSpriteSequenceLoader
+	{
+		public ClassicSpriteSequenceLoader(ModData modData)
+			: base(modData) { }
+
+		public override ISpriteSequence CreateSequence(ModData modData, TileSet tileSet, SpriteCache cache, string sequence, string animation, MiniYaml info)
+		{
+			return new ClassicSpriteSequence(modData, tileSet, cache, this, sequence, animation, info);
+		}
+	}
+
+	public class ClassicSpriteSequence : DefaultSpriteSequence
+	{
+		readonly bool useClassicFacings;
+
+		public ClassicSpriteSequence(ModData modData, TileSet tileSet, SpriteCache cache, ISpriteSequenceLoader loader, string sequence, string animation, MiniYaml info)
+			: base(modData, tileSet, cache, loader, sequence, animation, info)
+		{
+			var d = info.ToDictionary();
+			useClassicFacings = LoadField(d, "UseClassicFacings", false);
+
+			if (useClassicFacings && Facings != 32)
+				throw new InvalidOperationException(
+					"{0}: Sequence {1}.{2}: UseClassicFacings is only valid for 32 facings"
+					.F(info.Nodes[0].Location, sequence, animation));
+		}
+
+		protected override int QuantizeFacing(int facing)
+		{
+			return OpenRA.Mods.Cnc.Util.ClassicQuantizeFacing(facing, Facings, useClassicFacings);
+		}
+	}
+}