Add initial standard library, and port shellmaps.

OpenRA.Mods.RA/Scripting/ScriptInvulnerable.cs

@@ -0,0 +1,28 @@
+#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 OpenRA.GameRules;
+using OpenRA.Traits;
+
+namespace OpenRA.Mods.RA
+{
+	[Desc("Allows map scripts to make this actor invulnerable via actor.Invulnerable = true.")]
+	class ScriptInvulnerableInfo : TraitInfo<ScriptInvulnerable> {}
+
+	class ScriptInvulnerable : IDamageModifier
+	{
+		public bool Invulnerable = false;
+
+		public float GetDamageModifier(Actor attacker, WarheadInfo warhead)
+		{
+			return Invulnerable ? 0.0f : 1.0f;
+		}
+	}
+}