fix: Adds GetClients to map iterators (#1574)

### Summary

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

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

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

@@ -129,9 +129,7 @@ public partial class Campfire : Item
             }
         }
 
-        var eable = GetClientsInRange(SecureRange);
-
-        foreach (var state in eable)
+        foreach (var state in GetClientsInRange(SecureRange))
         {
             if (state.Mobile is PlayerMobile pm && GetEntry(pm) == null)
             {