Revisit IJsonOutputFormatter

[danroth27]

IJsonOutputFormatter is currently just used as a marker interface to indicate that a formatter outputs JSON. We should revisit this approach and see if we can come up with something cleaner and more general.

[danroth27]

We decided to remove the dependency on formatting in JsonResult and JsonViewComponentResult and instead just use JSON.NET directly. Remove IJsonOutputFormatter as part of this work.

[ajaybhargavb]

Part 1 - f206cf6

[JamesNK]

Are the serializer settings from MvcJsonOptions still used by default?

I don't have an environment to test on right now but judging by https://github.com/aspnet/Mvc/blob/dev/src/Microsoft.AspNet.Mvc.Extensions/Controller.cs#L400 I'm guessing they aren't.

[rynowak]

I look a look here and @JamesNK is right. This should be respecting MvcJsonOptions