Allow Attack activities to target FrozenActors directly.

Removing the legacy FrozenActor to Actor workaround
fixes a number of long-standing bugs.

This also prevents units from losing their target when
it transforms into a different actor type.

OpenRA.Mods.Common/Traits/Attack/AttackFrontal.cs

@@ -57,7 +57,7 @@ namespace OpenRA.Mods.Common.Traits
 
 		public override Activity GetAttackActivity(Actor self, Target newTarget, bool allowMove, bool forceAttack)
 		{
-			return new Activities.Attack(self, newTarget, allowMove, forceAttack, info.FacingTolerance);
+			return new Activities.Attack(self, newTarget, allowMove, forceAttack);
 		}
 	}
 }