Add a damage parameter to Lua OnDamage callback

OpenRA.Mods.Common/Scripting/Global/TriggerGlobal.cs

@@ -74,7 +74,7 @@ namespace OpenRA.Mods.Common.Scripting
 		}
 
 		[Desc("Call a function when the actor is damaged. The callback " +
-			"function will be called as func(Actor self, Actor attacker).")]
+			"function will be called as func(Actor self, Actor attacker, int damage).")]
 		public void OnDamaged(Actor a, LuaFunction func)
 		{
 			GetScriptTriggers(a).RegisterCallback(Trigger.OnDamaged, func, Context);

OpenRA.Mods.Common/Scripting/ScriptTriggers.cs

@@ -118,7 +118,8 @@ namespace OpenRA.Mods.Common.Scripting
 				try
 				{
 					using (var b = e.Attacker.ToLuaValue(f.Context))
-						f.Function.Call(f.Self, b).Dispose();
+					using (var c = e.Damage.Value.ToLuaValue(f.Context))
+						f.Function.Call(f.Self, b, c).Dispose();
 				}
 				catch (Exception ex)
 				{