Unhardcode voice/order interaction; reimplement for move and attack

OpenRA.Game/Traits/TraitsInterfaces.cs

@@ -36,6 +36,7 @@ namespace OpenRA.Traits
 	public interface IIssueOrder { Order IssueOrder( Actor self, int2 xy, MouseInput mi, Actor underCursor ); }
 	public interface IResolveOrder { void ResolveOrder(Actor self, Order order); }
 	public interface IOrderCursor { string CursorForOrder(Actor self, Order order); }
+	public interface IOrderVoice { string VoicePhraseForOrder(Actor self, Order order); }
 
 	public interface INotifySold { void Selling( Actor self );  void Sold( Actor self ); }
 	public interface INotifyDamage { void Damaged(Actor self, AttackInfo e); }