feat: Source generated Serialization/Deserialization (#550)

### Features
* Fully abstracts serialization by using compile-time attributes.
* Supports serializing the following:
  - Primitives (integers, strings, etc)
  - IP Addresses
  - BigDecimal
  - DateTime, Delta DateTimes
  - TimeSpan
  - Server.Race
  - Server.Map
  - Point2D, Point3D, Rect2D, Rect3D
  - Existing/New `ISerializable` references
  - Lists/Sets of serializable types
  - Type with a `Serialize` method and constructor that takes an `IGenericReader`
* Supports forward-only migration
* Supports existing RunUO deserialization for older versions by changing to the following signature:
  - `public void OldDeserialize(IGenericReader reader, int version)`
  - Must remove deserializing the version since this is already done
* Supports serializing from private fields or custom made properties.
* Types do not require inheriting Item/Mobile. Code gen will fully create `ISerializable` information.
  - This is not recommended yet, since it requires wiring to `Persistence` which will cause lots of unresolved symbol errors until code gen is built.

### Example
```cs
using System.Collections.Generic;

namespace Server.Items
{
    [Serializable(1)]
    public partial class TestItem1 : Item
    {
        [SerializableField(1)]
        [SerializableFieldAttr("[CommandProperty(AccessLevel.Administrator)]")]
        private List<Item> _someProperty;

        private void Deserialize(IGenericReader reader, int version)
        {
        }
    }
}
```

Generates this:
```cs
namespace Server.Items
{
    public partial class TestItem1
    {
#pragma warning disable 0414
        private const int _version = 1;
#pragma warning restore 0414

        [CommandProperty(AccessLevel.Administrator)]
        public System.Collections.Generic.List<Server.Item> SomeProperty
        {
            get => _someProperty;
            set
            {
                if (value != _someProperty)
                {
                    ((ISerializable)this).MarkDirty();
                    _someProperty = value;
                }
            }
        }

        public TestItem1(Serial serial) : base(serial)
        {
        }

        public override void Serialize(IGenericWriter writer)
        {
            var savePosition = ((Server.ISerializable)this).SavePosition;
            if (savePosition > -1)
            {
                writer.Seek(savePosition, System.IO.SeekOrigin.Begin);
                return;
            }
            writer.WriteEncodedInt(_version);
            writer.Write(_someProperty);
        }

        public override void Deserialize(IGenericReader reader)
        {
            var version = reader.ReadEncodedInt();
            if (version < 1)
            {
                OldDeserialize(reader, version);
                ((Server.ISerializable)this).MarkDirty();
                return;
            }
            SomeProperty = reader.ReadEntityList<Server.Item>();
        }
    }
}
```

And this:
```json
{
  "version": 1,
  "type": "TestItem1",
  "properties": [
    {
      "name": "SomeProperty",
      "type": "System.Collections.Generic.List\u003CServer.Item\u003E",
      "rule": "ListMigrationRule",
      "ruleArguments": [
        "Server.Item",
        "SerializableInterfaceMigrationRule"
      ]
    }
  ]
}
```

Projects/SerializationGenerator/SourceGeneration/SourceGeneration.Arguments.cs

@@ -0,0 +1,125 @@
+/*************************************************************************
+ * ModernUO                                                              *
+ * Copyright (C) 2019-2021 - ModernUO Development Team                   *
+ * Email: hi@modernuo.com                                                *
+ * File: SourceGeneration.Arguments.cs                                   *
+ *                                                                       *
+ * This program is free software: you can redistribute it and/or modify  *
+ * it under the terms of the GNU General Public License as published by  *
+ * the Free Software Foundation, either version 3 of the License, or     *
+ * (at your option) any later version.                                   *
+ *                                                                       *
+ * You should have received a copy of the GNU General Public License     *
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>. *
+ *************************************************************************/
+
+using System.Collections.Generic;
+using System.Collections.Immutable;
+using System.Text;
+using Microsoft.CodeAnalysis;
+
+namespace SerializationGenerator
+{
+    public static partial class SourceGeneration
+    {
+        public static void GetTypesFromTypedConstant(TypedConstant arg, List<ITypeSymbol> list)
+        {
+            if (arg.Kind == TypedConstantKind.Type)
+            {
+                list.Add((ITypeSymbol)arg.Value);
+            }
+            else if (arg.Kind == TypedConstantKind.Array)
+            {
+                for (var i = 0; i < arg.Values.Length; i++)
+                {
+                    GetTypesFromTypedConstant(arg.Values[i], list);
+                }
+            }
+        }
+
+        public static void GenerateSignatureArguments(this StringBuilder source, ImmutableArray<(ITypeSymbol, string)> parameters)
+        {
+            for (var i = 0; i < parameters.Length; i++)
+            {
+                var (t, v) = parameters[i];
+                source.AppendFormat("{0} {1}", t.Name, v);
+                if (i < parameters.Length - 1)
+                {
+                    source.Append(", ");
+                }
+            }
+        }
+
+        public static void GenerateNamedArgument(this StringBuilder source, KeyValuePair<string, TypedConstant> namedArg)
+        {
+            source.AppendFormat("{0} = ", namedArg.Key);
+            source.GenerateTypedConstant(namedArg.Value);
+        }
+
+        public static void GenerateTypedConstants(this StringBuilder source, ImmutableArray<TypedConstant> args)
+        {
+            source.Append("new []{");
+            for (var i = 0; i < args.Length; i++)
+            {
+                source.GenerateTypedConstant(args[i]);
+                if (i < args.Length - 1)
+                {
+                    source.Append(", ");
+                }
+            }
+            source.Append('}');
+        }
+
+        public static void GenerateTypedConstant(this StringBuilder source, TypedConstant arg)
+        {
+            if (arg.IsNull)
+            {
+                source.Append("null");
+                return;
+            }
+
+            switch (arg.Kind)
+            {
+                default:
+                    {
+                        return;
+                    }
+                case TypedConstantKind.Primitive:
+                    {
+
+                        if (arg.Value is string str)
+                        {
+                            source.AppendFormat("\"{0}\"", str);
+                        }
+                        else
+                        {
+                            source.Append(arg.Value);
+                        }
+                        break;
+                    }
+                case TypedConstantKind.Enum:
+                    {
+                        if (arg.Type == null || arg.Value == null)
+                        {
+                            source.Append("null");
+                        }
+                        else
+                        {
+                            source.AppendFormat("({0}){1}", arg.Type.ToDisplayString(), arg.Value);
+                        }
+                        break;
+                    }
+                case TypedConstantKind.Type:
+                    {
+                        source.AppendFormat("typeof({0})", ((ITypeSymbol)arg.Value)?.Name);
+                        break;
+                    }
+                case TypedConstantKind.Array:
+                    {
+                        source.GenerateTypedConstants(arg.Values);
+                        break;
+                    }
+            }
+        }
+    }
+}