Discusion - Transform Serializer to be a singletone or use a Serializer singletone

[Unsigno]

I don't checked if there is a technical reason to don't do it , but this should be more simple and representative . So we don't need to keep and pass the serializer instances .

[OpherV]

In a way it's already a singleton, just not very explicit. I don't have an issue with it being a singleton to clean up the API a bit on both the client and the server.
PR welcome!