Refactor BurstDelay to BurstDelays

Allowing to set custom per-burst delays.

OpenRA.Game/GameRules/WeaponInfo.cs

@@ -69,8 +69,9 @@ namespace OpenRA.GameRules
 		[Desc("What types of targets are unaffected.", "Overrules ValidTargets.")]
 		public readonly HashSet<string> InvalidTargets = new HashSet<string>();
 
-		[Desc("Delay in ticks between firing shots from the same ammo magazine.")]
-		public readonly int BurstDelay = 5;
+		[Desc("Delay in ticks between firing shots from the same ammo magazine. If one entry, it will be used for all bursts.",
+			"If multiple entries, their number needs to match Burst - 1.")]
+		public readonly int[] BurstDelays = { 5 };
 
 		[Desc("The minimum range the weapon can fire.")]
 		public readonly WDist MinRange = WDist.Zero;