V11/userinfo - [De]Serialize the user information

[KevinJump]

This PR adds the ability for us to serialize and deserialize the creator, writer and publisher of a peice of content.
it also adds the ability for the user to be passed in the uSyncImportOptions so the user can be set on a remote call.

1. let you preserve user information between syncs if you want to (and the users exist)
2. Let uSync.Complete push the user who is making changes from one site to another.

Additional Setting to turn this on in uSync:

"ContemtHandler": {
  "Settings": {
    "IncludeUserInfo": true
  }
},

[KevinJump]

This PR does change the signature of a few of the serializers, anything using them as a base class will also require an upgrade.