Add Sell to the Lua API.

OpenRA.Mods.Common/OpenRA.Mods.Common.csproj

@@ -252,6 +252,7 @@
     <Compile Include="Scripting\Properties\ProductionProperties.cs" />
     <Compile Include="Scripting\Properties\RepairableBuildingProperties.cs" />
     <Compile Include="Scripting\Properties\ResourceProperties.cs" />
+    <Compile Include="Scripting\Properties\SellableProperties.cs" />
     <Compile Include="Scripting\Properties\TransformProperties.cs" />
     <Compile Include="Scripting\Properties\TransportProperties.cs" />
     <Compile Include="Scripting\Properties\UpgradeProperties.cs" />

OpenRA.Mods.Common/Scripting/Properties/SellableProperties.cs

@@ -0,0 +1,31 @@
+#region Copyright & License Information
+/*
+ * Copyright 2007-2016 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.Mods.Common.Traits;
+using OpenRA.Scripting;
+using OpenRA.Traits;
+
+namespace OpenRA.Mods.Common.Scripting
+{
+	[ScriptPropertyGroup("General")]
+	public class SellableProperties : ScriptActorProperties, Requires<SellableInfo>
+	{
+		public SellableProperties(ScriptContext context, Actor self)
+			: base(context, self) { }
+
+		[Desc("Start selling the actor.")]
+		public void Sell()
+		{
+			// PERF: No trait lookup cache in the constructor to avoid doing it for all buildings except just the ones getting sold.
+			Self.Trait<Sellable>().Sell(Self);
+		}
+	}
+}