Remove legacy .aud sound defaults from Common traits

While C&C-specific sound defaults might be acceptable for C&C-specific traits like MadTank and Chronoshiftable, for common, generic traits like Building they no longer are.

OpenRA.Mods.Common/Traits/Buildings/Building.cs

@@ -55,9 +55,9 @@ namespace OpenRA.Mods.Common.Traits
 		[Desc("Clear smudges from underneath the building footprint on transform.")]
 		public readonly bool RemoveSmudgesOnTransform = true;
 
-		public readonly string[] BuildSounds = { "placbldg.aud", "build5.aud" };
+		public readonly string[] BuildSounds = { };
 
-		public readonly string[] UndeploySounds = { "cashturn.aud" };
+		public readonly string[] UndeploySounds = { };
 
 		public virtual object Create(ActorInitializer init) { return new Building(init, this); }
 

OpenRA.Mods.Common/Traits/EjectOnDeath.cs

@@ -26,7 +26,7 @@ namespace OpenRA.Mods.Common.Traits
 		public readonly int SuccessRate = 50;
 
 		[Desc("Sound to play when ejecting the pilot from the aircraft.")]
-		public readonly string ChuteSound = "chute1.aud";
+		public readonly string ChuteSound = null;
 
 		[Desc("Can a destroyed aircraft eject its pilot while it has not yet fallen to ground level?")]
 		public readonly bool EjectInAir = false;

OpenRA.Mods.Common/Traits/ParaDrop.cs

@@ -23,7 +23,7 @@ namespace OpenRA.Mods.Common.Traits
 		public readonly WDist DropRange = WDist.FromCells(4);
 
 		[Desc("Sound to play when dropping.")]
-		public readonly string ChuteSound = "chute1.aud";
+		public readonly string ChuteSound = null;
 
 		public object Create(ActorInitializer init) { return new ParaDrop(init.Self, this); }
 	}

OpenRA.Mods.Common/Traits/ProductionParadrop.cs

@@ -25,7 +25,7 @@ namespace OpenRA.Mods.Common.Traits
 		[ActorReference(typeof(AircraftInfo))] public readonly string ActorType = "badr";
 
 		[Desc("Sound to play when dropping the unit.")]
-		public readonly string ChuteSound = "chute1.aud";
+		public readonly string ChuteSound = null;
 
 		[Desc("Notification to play when dropping the unit.")]
 		public readonly string ReadyAudio = null;