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/Skills/DetectHidden.cs

@@ -81,8 +81,6 @@ namespace Server.SkillHandlers
                         }
                     }
 
-                    inRange.Free();
-
                     if (Faction.Find(src) != null)
                     {
                         var itemsInRange = src.Map.GetItemsInRange<BaseFactionTrap>(p, range);
@@ -103,8 +101,6 @@ namespace Server.SkillHandlers
                                 foundAnyone = true;
                             }
                         }
-
-                        itemsInRange.Free();
                     }
                 }
 

Projects/UOContent/Skills/Hiding.cs

@@ -69,8 +69,6 @@ namespace Server.SkillHandlers
                             break;
                         }
                     }
-
-                    eable.Free();
                 }
 
                 ok = !badCombat && m.CheckSkill(SkillName.Hiding, 0.0 - bonus, 100.0 - bonus);

Projects/UOContent/Skills/Snooping.cs

@@ -77,8 +77,6 @@ public static class Snooping
                             ns.Mobile.SendMessage(message);
                         }
                     }
-
-                    eable.Free();
                 }
             }
 

Projects/UOContent/Skills/SpiritSpeak.cs

@@ -134,7 +134,6 @@ namespace Server.SkillHandlers
                         break;
                     }
                 }
-                eable.Free();
 
                 var min = 1 + (int)(Caster.Skills.SpiritSpeak.Value * 0.25);
                 var max = min + 4;

Projects/UOContent/Skills/Tracking/Tracking.cs

@@ -225,7 +225,6 @@ namespace Server.SkillHandlers
                     list.Add(m);
                 }
             }
-            eable.Free();
 
             if (list.Count > 0)
             {