NewManager create new Manager.

RegisterDefaults register defaults serializer for each of the default serializer keys (data,json,jsonp,text,xml).

NotAllowedKeyChar the rune which is not allowed to be inside a serializer key string this exists because almost all package's users will use kataras/go-template with kataras/go-serializer in one method, so we need something to tell if the 'renderer' wants to render a serializer's result or the template's result, you don't have to worry about these things.

Manager is optionally, used when your app needs to manage more than one serializer keeps a map with a key of the ContentType(or any string) and a collection of Manager if a ContentType(key) has more than one serializer registered to it then the final result will be all of the serializer's results combined.

Options is just a shortcut of a map[string]interface{}, which can be passed to the Serialize/SerializeToString funcs.