Reset burst counter if ReloadDelay has passed since last shot

This fixes the following issues:
- units like mammoth tanks sometimes at first only fired 1 shot on new encounter because they only depleted 1 burst before previous target was killed
- weapons that use strafing logic would not reset the offset multiplier after passing the target once, leading to wrong offsets on following attacks

OpenRA.Mods.Common/Traits/Armament.cs

@@ -113,6 +113,8 @@ namespace OpenRA.Mods.Common.Traits
 		IEnumerable<int> damageModifiers;
 		IEnumerable<int> inaccuracyModifiers;
 
+		int ticksSinceLastShot;
+
 		List<Pair<int, Action>> delayedActions = new List<Pair<int, Action>>();
 
 		public WDist Recoil;
@@ -169,6 +171,9 @@ namespace OpenRA.Mods.Common.Traits
 			if (IsTraitDisabled)
 				return;
 
+			if (ticksSinceLastShot < Weapon.ReloadDelay)
+				++ticksSinceLastShot;
+
 			if (FireDelay > 0)
 				--FireDelay;
 
@@ -221,6 +226,11 @@ namespace OpenRA.Mods.Common.Traits
 			if (!Weapon.IsValidAgainst(target, self.World, self))
 				return null;
 
+			if (ticksSinceLastShot >= Weapon.ReloadDelay)
+				Burst = Weapon.Burst;
+
+			ticksSinceLastShot = 0;
+
 			var barrel = Barrels[Burst % Barrels.Length];
 			Func<WPos> muzzlePosition = () => self.CenterPosition + MuzzleOffset(self, barrel);
 			var legacyFacing = MuzzleOrientation(self, barrel).Yaw.Angle / 4;

mods/ra/weapons/smallcaliber.yaml

@@ -23,8 +23,8 @@
 ZSU-23:
 	Inherits: ^AACannon
 	Burst: 2
-	BurstDelay: 5
+	BurstDelay: 0
-	ReloadDelay: 0
+	ReloadDelay: 5
 	Range: 10c0
 	Projectile: Bullet
 		Speed: 3c340