More abilities, refactor stealing held items

Plugins/PkmnLib.Plugin.Gen7/Scripts/Moves/BugBite.cs

@@ -13,11 +13,12 @@ public class BugBite : Script
 
         var targetHeldItem = target.HeldItem;
 
-        if (targetHeldItem is not { Category: ItemCategory.Berry })
+        if (targetHeldItem is not { Category: ItemCategory.Berry } || !target.TryStealHeldItem(out targetHeldItem))
         {
             move.GetHitData(target, hit).Fail();
             return;
         }
+
         _ = target.SetHeldItem(null);
         targetHeldItem.RunItemScript(battleData.Battle.Library.ScriptResolver, user);
     }

Plugins/PkmnLib.Plugin.Gen7/Scripts/Moves/Covet.cs

@@ -8,8 +8,8 @@ public class Covet : Script
     {
         if (target.HeldItem == null)
             return;
-        if (move.User.HeldItem != null)
+        if (!move.User.TryStealHeldItem(out var item))
             return;
-        _ = move.User.SetHeldItem(target.RemoveHeldItemForBattle());
+        _ = move.User.SetHeldItem(item);
     }
 }

Plugins/PkmnLib.Plugin.Gen7/Scripts/Moves/Incinerate.cs

@@ -6,9 +6,11 @@ public class Incinerate : Script
     /// <inheritdoc />
     public override void OnSecondaryEffect(IExecutingMove move, IPokemon target, byte hit)
     {
-        if (target.HeldItem is { Category: ItemCategory.Berry })
+        if (target.HeldItem is not { Category: ItemCategory.Berry } || !target.TryStealHeldItem(out _))
         {
-            target.RemoveHeldItemForBattle();
+            move.GetHitData(target, hit).Fail();
+            return;
         }
+        // TODO: Add message for item incineration
     }
 }

Plugins/PkmnLib.Plugin.Gen7/Scripts/Moves/KnockOff.cs

@@ -6,7 +6,7 @@ public class KnockOff : Script
     /// <inheritdoc />
     public override void OnSecondaryEffect(IExecutingMove move, IPokemon target, byte hit)
     {
-        if (target.RemoveHeldItemForBattle() is null)
+        if (!target.TryStealHeldItem(out var item))
         {
             move.GetHitData(target, hit).Fail();
         }