Core: Added the attacker to IDamageModifier' GetDamageModifier

OpenRA.Game/Traits/Health.cs

@@ -82,7 +82,7 @@ namespace OpenRA.Traits
 			
 			/* apply the damage modifiers, if we have any. */
             var modifier = (float)self.TraitsImplementing<IDamageModifier>().Concat(self.Owner.PlayerActor.TraitsImplementing<IDamageModifier>())
-				.Select(t => t.GetDamageModifier(warhead)).Product();
+				.Select(t => t.GetDamageModifier(attacker, warhead)).Product();
 
 			damage = (int)(damage * modifier);
 

OpenRA.Game/Traits/TraitsInterfaces.cs

@@ -106,7 +106,7 @@ namespace OpenRA.Traits
 
 	public interface INotifyAttack { void Attacking(Actor self); }
 	public interface IRenderModifier { IEnumerable<Renderable> ModifyRender(Actor self, IEnumerable<Renderable> r); }
-	public interface IDamageModifier { float GetDamageModifier( WarheadInfo warhead ); }
+    public interface IDamageModifier { float GetDamageModifier(Actor attacker, WarheadInfo warhead); }
 	public interface ISpeedModifier { float GetSpeedModifier(); }
 	public interface IFirepowerModifier { float GetFirepowerModifier(); }
 	public interface IPalette { void InitPalette( WorldRenderer wr ); }