Add plumbing for mod-defined terrain loaders.

OpenRA.Mods.Common/Terrain/DefaultTerrain.cs

@@ -0,0 +1,26 @@
+#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 OpenRA.FileSystem;
+using OpenRA.Graphics;
+
+namespace OpenRA.Mods.Common.Terrain
+{
+	public class DefaultTerrainLoader : ITerrainLoader
+	{
+		public DefaultTerrainLoader(ModData modData) { }
+
+		public ITerrainInfo ParseTerrain(IReadOnlyFileSystem fileSystem, string path)
+		{
+			return new TileSet(fileSystem, path);
+		}
+	}
+}