fix: Cleans up entity persistence. Generalizes Mobiles/Items/Guilds (#1528)

### Summary
- [X] Fixed a bug where entity persistence was serialized out of order, causing world corruption.
- [X] Fixed LastSerialized not being utilized properly and dangling references still becoming an issue.
- [X] Added a new `GenericEntityPersistence<T>` type to encapsulate `ISerializable` serialization.
- [X] Removing the custom logic and moved Items, Mobiles, Guilds, and Accounts  to GenericEntityPersistence.
- [X] Changed serialization to use the singleton pattern to reduce calling methods from stored variables.

Projects/UOContent/Items/Weapons/BaseWeapon.cs

@@ -1857,7 +1857,7 @@ public abstract partial class BaseWeapon : Item, IWeapon, IFactionItem, ICraftab
 
         if (attacker is PlayerMobile pmAttacker && !(Core.ML && defender is PlayerMobile))
         {
-            if (pmAttacker.GetVirtues()?.HonorActive == true && pmAttacker.InRange(defender, 1))
+            if (VirtueSystem.GetVirtues(pmAttacker)?.HonorActive == true && pmAttacker.InRange(defender, 1))
             {
                 percentageBonus += 25;
             }