Added the ability to execute arbitrary code after deserialization.
Example, let's say you want to delete an item after you deserialize it:
```cs
[AfterDeserialization]
private void OnAfterDeserialization()
{
Delete();
}
```
Generates this:
```cs
public override void Deserialize(IGenericReader reader)
{
base.Deserialize(reader);
var version = reader.ReadEncodedInt();
Timer.DelayCall(OnAfterDeserialization);
}
```
