fix: Fixes various memory leaks and spells (#1786)

### Summary
- Fixes various memory leaks related to spells
- Fixes Spell Plague
- Added ability to determine if `sdi` should take effect for Spell Damage.
- Fixes animal form timer ticking non-stop while logged out.

Projects/UOContent/Accounting/AccountHandler.cs

@@ -9,6 +9,12 @@ using Server.Engines.Virtues;
 using Server.Logging;
 using Server.Network;
 using Server.Regions;
+using Server.Spells.Fifth;
+using Server.Spells.First;
+using Server.Spells.Mysticism;
+using Server.Spells.Necromancy;
+using Server.Spells.Ninjitsu;
+using Server.Spells.Second;
 
 namespace Server.Misc;
 
@@ -235,6 +241,15 @@ public static class AccountHandler
                 PlayerMurderSystem.OnPlayerDeleted(m);
                 ChampionTitleSystem.OnPlayerDeleted(m);
 
+                // Spells
+                MagicReflectSpell.EndReflect(m);
+                ReactiveArmorSpell.EndArmor(m);
+                ProtectionSpell.EndProtection(m);
+                StoneFormSpell.RemoveEffects(m);
+                AnimateDeadSpell.RemoveEffects(m);
+                SummonFamiliarSpell.RemoveEffects(m);
+                AnimalForm.RemoveLastAnimalForm(m);
+
                 state.SendCharacterListUpdate(acct);
                 return;
             }