fix: Changes Map.Sector.Mobiles to link list & Fixes various related crash bugs (#1553)

### Summary

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

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

- [X] Fixed several locations where an NPC that was damaged would cause a server crash.
- [X] Removed an unnecessary allocation in guard fake calls (NPCs calling guards on you)
- [X] Fixes damage precision loss in Poison Strike Spell
- [X] BogThing no longer attempts to "search" for boglings to eat when it is at full health

Projects/UOContent/Skills/Hiding.cs

@@ -60,8 +60,7 @@ namespace Server.SkillHandlers
             {
                 if (!CombatOverride)
                 {
-                    var eable = m.GetMobilesInRange(range);
-                    foreach (var check in eable)
+                    foreach (var check in m.GetMobilesInRange(range))
                     {
                         if (check.InLOS(m) && check.Combatant == m)
                         {