fix(core): Fixes encoded int. Adds dirty checking opt-out (#619)

### Additions
- Automatically opts-out `Item/Mobile/Guild/Accounts` from dirty checking with a new property `UseDirtyChecking`
- Codegen now enables `UseDirtyChecking` via getter. This requires that the property is `virtual` for derived types.

### Fixes
- Fixes `EncodedInt` being broken
- Fixes issues with new custom serializable types that are not derived from Item/Mobile/etc.
- Removes double dirty checking.

### Example of a brand new serializable type that isn't an Item/Mobile/etc.
User created code:
```cs
using System;

namespace Server.Items
{
    [Serializable(0)]
    public partial class NewTestEntityObject : ISerializable
    {
        [EncodedInt]
        [SerializableField(0)]
        private int _someProperty;

        public NewTestEntityObject()
        {
            SetTypeRef(GetType());
            // Add to serial tracking like World.Item
            /*
            Serial = World.NewEntity;
            World.AddEntity(this);
            */
        }

        [AfterDeserialization]
        private void AfterDeserialization()
        {
            Console.WriteLine("This ran!");
        }

        public int TypeRef { get; }
        public Serial Serial { get; }
        public void Delete()
        {
        }

        public bool Deleted { get; set; }
        public void SetTypeRef(Type type)
        {
            // Type tracking for persistence goes here
            /*
            TypeRef = World.NewEntityTypes.IndexOf(type);
            if (TypeRef == -1)
            {
                World.NewEntityTypes.Add(type);
                TypeRef = World.NewEntityTypes.Count - 1;
            }
            */
        }
    }
}
```

Generated code:
```cs
namespace Server.Items
{
    public partial class NewTestEntityObject
    {
#pragma warning disable 0414
        private const int _version = 0;
#pragma warning restore 0414

        public int SomeProperty
        {
            get => _someProperty;
            set
            {
                if (value != _someProperty)
                {
                    _someProperty = value;
                    ((ISerializable)this).MarkDirty();
                }
            }
        }

        long ISerializable.SavePosition { get; set; } = -1;
        BufferWriter ISerializable.SaveBuffer { get; set; }
        bool ISerializable.UseDirtyChecking => true;

        public NewTestEntityObject(Serial serial)
        {
            Serial = serial;
            SetTypeRef(typeof(NewTestEntityObject));
        }

        public void Serialize(IGenericWriter writer)
        {

            writer.WriteEncodedInt(_version);

            writer.WriteEncodedInt(SomeProperty);
        }

        public void Deserialize(IGenericReader reader)
        {
            var version = reader.ReadEncodedInt();

            SomeProperty = reader.ReadEncodedInt();

            Timer.DelayCall(AfterDeserialization);
        }
    }
}
```

Projects/SerializationGenerator/SerializableEntityGeneration/SerializableEntityGeneration.Class.cs

@@ -101,11 +101,11 @@ namespace SerializationGenerator
 
             source.GenerateClassStart(
                 className,
-                isOverride ?
-                    ImmutableArray<ITypeSymbol>.Empty :
-                    ImmutableArray.Create<ITypeSymbol>(serializableInterface)
+                ImmutableArray<ITypeSymbol>.Empty
             );
 
+            const string indent = "        ";
+
             source.GenerateClassField(
                 AccessModifier.Private,
                 InstanceModifier.Const,
@@ -199,15 +199,16 @@ namespace SerializationGenerator
             // If we are not inheriting ISerializable, then we need to define some stuff
             if (!isOverride)
             {
-                // long ISerializable.SavePosition { get; set; }
+                // long ISerializable.SavePosition { get; set; } = -1;
                 source.GenerateAutoProperty(
                     AccessModifier.None,
                     "long",
                     "ISerializable.SavePosition",
                     AccessModifier.None,
-                    AccessModifier.None
+                    AccessModifier.None,
+                    indent,
+                    defaultValue: "-1"
                 );
-                source.AppendLine();
 
                 // BufferWriter ISerializable.SaveBuffer { get; set; }
                 source.GenerateAutoProperty(
@@ -215,7 +216,35 @@ namespace SerializationGenerator
                     "BufferWriter",
                     "ISerializable.SaveBuffer",
                     AccessModifier.None,
-                    AccessModifier.None
+                    AccessModifier.None,
+                    indent
+                );
+
+                // bool ISerializable.UseDirtyChecking { get; } = true;
+                source.GenerateAutoProperty(
+                    AccessModifier.None,
+                    "bool",
+                    "ISerializable.UseDirtyChecking",
+                    AccessModifier.None,
+                    null,
+                    indent,
+                    defaultValue: "true"
+                );
+                source.AppendLine();
+            }
+            else
+            {
+                // If this type does not *directly* inherit `ISerializable`, then we assume it has an overridable `UseDirtyChecking`
+                // public override bool ISerializable.UseDirtyChecking { get; } = true;
+                source.GenerateAutoProperty(
+                    AccessModifier.Public,
+                    "bool",
+                    "UseDirtyChecking",
+                    AccessModifier.None,
+                    null,
+                    indent,
+                    defaultValue: "true",
+                    isOverride: true
                 );
                 source.AppendLine();
             }