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/Skills/Snooping.cs

@@ -68,9 +68,7 @@ public static class Snooping
                 {
                     var message = $"You notice {from.Name} attempting to peek into {root.Name}'s belongings.";
 
-                    var eable = map.GetClientsInRange(from.Location, 8);
-
-                    foreach (var ns in eable)
+                    foreach (var ns in map.GetClientsInRange(from.Location, 8))
                     {
                         if (ns.Mobile != from)
                         {