fix: Adds ReadType/Write(Type) and improves type referencing (#1172)

## Changes
* Improves type hashing by introducing xxHash3 (64bit)
* Removes individual `tdb` files in favor of a single `SerializedTypes.db` file. This file is only used to identify a type that is being deserialized, which doesn't exist.
* Adds duplicate type alias detection
* Adds `AssemblyHandler.FindTypeByHash`

View changed files whitespaces: https://github.com/modernuo/ModernUO/pull/1172/files?diff=split&w=1

## SerializedTypes.db
The serialized types file is used to get back the original name of a type in case it no longer exists in code. This can easily be necessary if a class is renamed in code and no `TypeAlias` is provided.

### Format
byte[4] - version
byte[4] - count
--array--
byte[8] - xxHash
byte[1] - flag, 0 - null, 1 - not null
byte[n] - Full class name in UTF8

### Example
<img width="472" alt="SerializedTypes_Example" src="https://user-images.githubusercontent.com/3953314/195255429-31d24293-6bd1-419e-811b-07874dd0f78d.png">

## Benchmarks
Serialized 500 Type fields. The 8192bytes comes from the _ConcurrentQueue_ that would later be used for SerializedTypes.
Note that the queue is never cleared, so it's size grew considerably.
```cs
|               Method |     Mean |    Error |   StdDev | Allocated |
|--------------------- |---------:|---------:|---------:|----------:|
|      BenchmarkXXHash | 18.44 us | 0.278 us | 0.260 us |    8192 B |
| BenchmarkTypeStrings | 25.09 us | 0.292 us | 0.259 us |         - |
```

TODO:
* Add support in the Serialization Generator for `ReadType()` and `Write(Type)`
* Remove `SetTypeRef` from Serialization Generator

Projects/UOContent/Accounting/Account.cs

@@ -15,6 +15,10 @@ namespace Server.Accounting
     [SerializationGenerator(4)]
     public partial class Account : IAccount, IComparable<Account>, ISerializable
     {
+        public void SetTypeRef(Type type)
+        {
+        }
+
         public static readonly TimeSpan YoungDuration = TimeSpan.FromHours(40.0);
         public static readonly TimeSpan InactiveDuration = TimeSpan.FromDays(180.0);
         public static readonly TimeSpan EmptyInactiveDuration = TimeSpan.FromDays(30.0);
@@ -145,7 +149,6 @@ namespace Server.Accounting
         public Account(XmlElement node)
         {
             Serial = Accounts.NewAccount;
-            SetTypeRef(GetType());
 
             _username = Utility.GetText(node["username"], "empty");
 
@@ -218,17 +221,6 @@ namespace Server.Accounting
             this.MarkDirty();
         }
 
-        public void SetTypeRef(Type type)
-        {
-            TypeRef = Accounts.Types.IndexOf(type);
-
-            if (TypeRef == -1)
-            {
-                Accounts.Types.Add(type);
-                TypeRef = Accounts.Types.Count - 1;
-            }
-        }
-
         /// <summary>
         ///     Object detailing information about the hardware of the last person to log into this account
         /// </summary>
@@ -305,8 +297,6 @@ namespace Server.Accounting
         [CommandProperty(AccessLevel.GameMaster)]
         DateTime ISerializable.LastSerialized { get; set; } = Core.Now;
 
-        public int TypeRef { get; private set; }
-
         public Serial Serial { get; set; }
 
         public void BeforeSerialize()

Projects/UOContent/Accounting/Accounts.cs

@@ -14,7 +14,6 @@ namespace Server.Accounting
         private static readonly Dictionary<string, Account> _accountsByName = new(32, StringComparer.OrdinalIgnoreCase);
         private static Dictionary<Serial, Account> _accountsById = new(32);
         private static Serial _lastAccount;
-        internal static List<Type> Types { get; } = new();
 
         private static void OutOfMemory(string message) => throw new OutOfMemoryException(message);
 
@@ -44,13 +43,18 @@ namespace Server.Accounting
         public static void Configure() =>
             Persistence.Register("Accounts", Serialize, WriteSnapshot, Deserialize);
 
-        internal static void Serialize() =>
-            EntityPersistence.SaveEntities(_accountsById.Values, account => ((ISerializable)account).Serialize());
+        internal static void Serialize()
+        {
+            EntityPersistence.SaveEntities(
+                _accountsById.Values,
+                account => ((ISerializable)account).Serialize(World.SerializedTypes)
+            );
+        }
 
         internal static void WriteSnapshot(string basePath)
         {
             IIndexInfo<Serial> indexInfo = new EntityTypeIndex("Accounts");
-            EntityPersistence.WriteEntities(indexInfo, _accountsById, Types, basePath, out _);
+            EntityPersistence.WriteEntities(indexInfo, _accountsById, basePath,World.SerializedTypes, out _);
         }
 
         public static IEnumerable<IAccount> GetAccounts() => _accountsByName.Values;
@@ -73,7 +77,7 @@ namespace Server.Accounting
             _accountsById.Remove(a.Serial);
         }
 
-        internal static void Deserialize(string path)
+        internal static void Deserialize(string path, Dictionary<ulong, string> typesDb)
         {
             var filePath = Path.Combine(path, "Accounts", "accounts.xml");
 
@@ -86,14 +90,14 @@ namespace Server.Accounting
 
             IIndexInfo<Serial> indexInfo = new EntityTypeIndex("Accounts");
 
-            _accountsById = EntityPersistence.LoadIndex(path, indexInfo, out List<EntitySpan<Account>> accounts);
+            _accountsById = EntityPersistence.LoadIndex(path, indexInfo, typesDb, out List<EntitySpan<Account>> accounts);
 
             if (_accountsById.Count > 0)
             {
                 _lastAccount = _accountsById.Keys.Max();
             }
 
-            EntityPersistence.LoadData(path, indexInfo, accounts);
+            EntityPersistence.LoadData(path, indexInfo, typesDb, accounts);
 
             foreach (var a in _accountsById.Values)
             {

Projects/UOContent/Items/Armor/Cloth/GargishClothKiltType2.cs

@@ -3,7 +3,6 @@ using ModernUO.Serialization;
 namespace Server.Items
 {
     [SerializationGenerator(0)]
-    [TypeAlias("Server.Items.GargishClothKilt", "Server.Items.GargishClothKiltArmor")]
     public partial class GargishClothKiltType2 : BaseArmor
     {
         [Constructible]

Projects/UOContent/Mobiles/Monsters/Reptile/Magic/SkeletalDragon.cs

@@ -1,5 +1,3 @@
-using System.Collections.Generic;
-
 namespace Server.Mobiles
 {
     public class SkeletalDragon : BaseCreature

Projects/UOContent/Spells/Chivalry/NobleSacrifice.cs

@@ -1,5 +1,4 @@
 using System;
-using System.Collections.Generic;
 using Server.Collections;
 using Server.Gumps;
 using Server.Items;