Support Controller Input from a Separate Application Instance

[BobbyShoe]

Do you think it would be possible to support connecting just the controller input for NanoClient from a separate application instance? Possibly what I am thinking is having one application do the streaming of audio and video, then having a separate application instance for each controller input. The current code base appears to only be hard coded to support player 1 in the NanoClient.OpenInputChannelAsync function where controllerIndex is hard coded to zero.

Initial attempts I tried failed in apparently StartGameStreamAsync. It is a little difficult to tell exactly where it fails, because the async calls end up timing out, and a relatively generic timeout error is received.

[tuxuser]

I dont plan to implement support for multiple controllers in the near future but would be happy to accept a PR for it.

For delivering input events "externally" something like a FIFO or Pipe could be used.

EDIT: Because the change was not trivial, I tried something in branch input_channel. However, looks like it needs a change still to correctly assign Channel in ChannelControl messages.