Core/Entities: Fixed disarming and related exploits

- Disarm shouldn't deduct stats other than weapon damage
- Ferals shouldn't be affected by disarm
- Fixed meta gem stacking exploit

src/server/game/Entities/Player/Player.h

@@ -2012,6 +2012,7 @@ class Player : public Unit, public GridObject<Player>
         void _ApplyAllItemMods();
         void _ApplyAllLevelScaleItemMods(bool apply);
         void _ApplyItemBonuses(ItemPrototype const *proto,uint8 slot,bool apply, bool only_level_scale = false);
+        void _ApplyWeaponDamage(uint8 slot, ItemPrototype const *proto, ScalingStatValuesEntry const *ssv, bool apply);
         void _ApplyAmmoBonuses();
         bool EnchantmentFitsRequirements(uint32 enchantmentcondition, int8 slot);
         void ToggleMetaGemsActive(uint8 exceptslot, bool apply);