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/Spells/Sixth/MassCurse.cs

@@ -32,9 +32,7 @@ namespace Server.Spells.Sixth
 
                 if (map != null)
                 {
-                    var eable = map.GetMobilesInRange(new Point3D(p), 2);
-
-                    foreach (var m in eable)
+                    foreach (var m in map.GetMobilesInRange(new Point3D(p), 2))
                     {
                         if (Core.AOS && (m == Caster || !SpellHelper.ValidIndirectTarget(Caster, m) || !Caster.CanSee(m) ||
                                          !Caster.CanBeHarmful(m, false)))

Projects/UOContent/Spells/Sixth/Reveal.cs

@@ -29,12 +29,8 @@ namespace Server.Spells.Sixth
 
                 if (map != null)
                 {
-                    var eable = map.GetMobilesInRange(
-                        new Point3D(p),
-                        1 + (int)(Caster.Skills.Magery.Value / 20.0)
-                    );
-
-                    foreach (var m in eable)
+                    var range = 1 + (int)(Caster.Skills.Magery.Value / 20.0);
+                    foreach (var m in map.GetMobilesInRange(new Point3D(p), range))
                     {
                         if (m is ShadowKnight && (m.X != p.X || m.Y != p.Y))
                         {