Move AirThreshold to Warhead

To reduce duplication and for later use in more warheads.

OpenRA.Mods.Common/Warheads/CreateEffectWarhead.cs

@@ -44,10 +44,6 @@ namespace OpenRA.Mods.Common.Warheads
 		[Desc("Chance of impact sound to play.")]
 		public readonly int ImpactSoundChance = 100;
 
-		[Desc("Consider explosion above this altitude an air explosion.",
-			"If that's the case, this warhead will consider the explosion position to have the 'Air' TargetType (in addition to any nearby actor's TargetTypes).")]
-		public readonly WDist AirThreshold = new WDist(128);
-
 		[Desc("Whether to consider actors in determining whether the explosion should happen. If false, only terrain will be considered.")]
 		public readonly bool ImpactActors = true;
 

OpenRA.Mods.Common/Warheads/LeaveSmudgeWarhead.cs

@@ -26,9 +26,6 @@ namespace OpenRA.Mods.Common.Warheads
 		[Desc("Type of smudge to apply to terrain.")]
 		public readonly HashSet<string> SmudgeType = new HashSet<string>();
 
-		[Desc("How close to ground must the impact happen to spawn smudges.")]
-		public readonly WDist AirThreshold = new WDist(128);
-
 		[Desc("Percentual chance the smudge is created.")]
 		public readonly int Chance = 100;
 

OpenRA.Mods.Common/Warheads/Warhead.cs

@@ -46,6 +46,9 @@ namespace OpenRA.Mods.Common.Warheads
 		[Desc("Can this warhead affect the actor that fired it.")]
 		public readonly bool AffectsParent = false;
 
+		[Desc("If impact is above this altitude, warheads that would affect terrain ignore terrain target types (and either do nothing or perform their own checks).")]
+		public readonly WDist AirThreshold = new WDist(128);
+
 		[Desc("Delay in ticks before applying the warhead effect.", "0 = instant (old model).")]
 		public readonly int Delay = 0;