Add support for stacked condition bonuses.

OpenRA.Mods.Common/Traits/Upgrades/StackedCondition.cs

@@ -0,0 +1,32 @@
+#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.Traits;
+
+namespace OpenRA.Mods.Common.Traits
+{
+	[Desc("Grant additional conditions when a specified condition has been granted multiple times.")]
+	public class StackedConditionInfo : TraitInfo<StackedCondition>
+	{
+		[FieldLoader.Require]
+		[UpgradeUsedReference]
+		[Desc("Condition to monitor.")]
+		public readonly string Condition = null;
+
+		[FieldLoader.Require]
+		[UpgradeGrantedReference]
+		[Desc("Conditions to grant when the monitored condition is granted multiple times.",
+			"The first entry is activated at 2x grants, second entry at 3x grants, and so on.")]
+		public readonly string[] StackedConditions = { };
+	}
+
+	public class StackedCondition { }
+}