Read item eq slots from the cache template

isTwoHanded, validForSlot, getSwingAnimation and the mob equipment set
read getItemEqSlotsOr/And, which drop the exporter's NONE. Offline parity
(p15c.py, 7586 rows): 0 differences once NONE is ignored.

Value changes:
- validForSlot: items whose only slot is NONE no longer pass for slot NONE.
- getSwingAnimation: the 7 slotless weapons (Rock 19297, Arrow 25650,
  siege ammo 29000/29010/29020/29030/29350) return the default 75 instead
  of indexing their empty left-hand anim list.
- MobBase equipment sets skip slotless items instead of keying them under
  NONE. No EQUIP booty entry references one (the 104 sets that do are ITEM
  booty sets).

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/engine/objects/MobBase.java

@@ -127,9 +127,13 @@ public class MobBase extends AbstractGameObject {
         for (BootySetEntry equipmentSetEntry : equipList) {
 
             Item item = new Item(equipmentSetEntry.templateID);
+
+            if (item.template.cacheTemplate.getItemEqSlotsOr().isEmpty())
+                continue;
+
             item.objectUUID = ItemManager.lastNegativeID.decrementAndGet();
             item.drop_chance = equipmentSetEntry.dropChance;
-            item.equipSlot = item.template.item_eq_slots_or.iterator().next();
+            item.equipSlot = item.template.cacheTemplate.getItemEqSlotsOr().iterator().next();
             equip.put(item.equipSlot, item);
 
         }