fix(codegen): Adds string intern, encoded int, enum and legacy version support (#613)

- [X] Adds Enum migration rule
- [X] Adds legacy version (writing full int for version field)
- [X] Adds encoded int attribute
- [X] Adds intern string attribute
- [X] Fixes missing base deserialize/serialize

Projects/Server/Serialization/SerializableAttribute.cs

@@ -21,7 +21,8 @@ namespace Server
     public sealed class SerializableAttribute : Attribute
     {
         public int Version { get; }
+        public bool EncodedVersion { get; }
 
-        public SerializableAttribute(int version) => Version = version;
+        public SerializableAttribute(int version, bool encodedVersion = true) => Version = version;
     }
 }