fix: Adds AfterSerialize support. Removes BeforeSerialize support. (#1208)

### Changes
* Implements an AfterSerialize method that is executed synchronously.
* Removes `BeforeSerialize` support since it was dangerous in its current implementation.
* Moves PlayerMobile kill/virtual decay to AfterSerialize.
* Adds kill decay to after Deserialize.

Projects/UOContent/Mobiles/PlayerMobile.cs

@@ -3402,6 +3402,17 @@ namespace Server.Mobiles
             writer.Write(GameTime);
         }
 
+        // Do we need to run an after serialize?
+        public override bool ShouldExecuteAfterSerialize => ShouldKillDecay() || ShouldAtrophy();
+
+        public override void AfterSerialize()
+        {
+            base.AfterSerialize();
+
+            CheckKillDecay();
+            CheckAtrophies();
+        }
+
         public bool ShouldAtrophy()
         {
             var sacrifice = SacrificeVirtue.ShouldAtrophy(this);