fix: Prepares for IPooledEnumerable removal (#1548)

### Summary

- Removes `IPooledEnumerable` (non-generic)
- Changes `IPooledEnumerable<T>` so that  `Free()` is replaced with the `IDisposable` pattern

Projects/UOContent/Items/Skill Items/Camping/Campfire.cs

@@ -143,8 +143,6 @@ public partial class Campfire : Item
                 pm.SendLocalizedMessage(500620); // You feel it would take a few moments to secure your camp.
             }
         }
-
-        eable.Free();
     }
 
     private void ClearEntries()

Projects/UOContent/Items/Skill Items/Magical/Potions/Explosion Potions/BaseExplosionPotion.cs

@@ -167,8 +167,6 @@ public abstract partial class BaseExplosionPotion : BasePotion
             }
         }
 
-        eable.Free();
-
         var min = Scale(from, MinDamage);
         var max = Scale(from, MaxDamage);
 

Projects/UOContent/Items/Skill Items/Misc/FireHorn.cs

@@ -115,8 +115,6 @@ public partial class FireHorn : Item
             }
         }
 
-        eable.Free();
-
         if (targets.Count > 0)
         {
             var prov = from.Skills.Provocation.Fixed;