Add attack delay to Shivers right after teleport

Now shivers cannot attack for 0.5 seconds after teleporting, which
should help with them getting cheap shots on players.

sources/Zeds/Nice/NiceZombieShiver.uc

@@ -3,6 +3,7 @@ class NiceZombieShiver extends NiceZombieShiverBase;
 var float TeleportBlockTime;
 var float HeadOffsetY;
 var transient bool bRunning, bClientRunning;
+var float teleportAttackCooldownEndTime;
 replication
 {
     reliable if ( Role == ROLE_Authority)
@@ -39,6 +40,12 @@ simulated function PostBeginPlay()
     }
 }
 
+function bool CanAttack(Actor target) {
+    if (level.timeSeconds < teleportAttackCooldownEndTime)
+        return false;
+    return super.CanAttack(target);
+}
+
 simulated event SetAnimAction(name NewAction) {
     local int meleeAnimIndex;
 
@@ -407,6 +414,7 @@ function FlashTeleport()
 Teleported:
     bFlashTeleporting = false;
     LastFlashTime = Level.TimeSeconds;
+    teleportAttackCooldownEndTime = level.timeSeconds + 0.5;
 }
 function Died(Controller Killer, class<DamageType> damageType, vector HitLocation)
 {