fix: Changes Map.Sector.Items to link list. (#1547)

### Summary

Eliminates `IPooledEnumerable<T>` and `eable.Free()` from `Map` for items. This drastically simplifies code that iterates in range, for example:

```cs
foreach (var item in m.GetItemsInRange(5))
{
}
```
The code above no longer requires an eable and calling `Free()`.

Projects/UOContent/Engines/Ethics/Core/Ethic.cs

@@ -155,10 +155,9 @@ namespace Server.Ethics
                         continue;
                     }
 
-                    var eable = e.Mobile.GetItemsInRange(2);
                     var found = false;
 
-                    foreach (var item in eable)
+                    foreach (var item in e.Mobile.GetItemsInRange(2))
                     {
                         if (item is AnkhNorth or AnkhWest)
                         {