Allow the Quest to be cable tethered to a PC or monitor to cast without the need for Wifi

[bill_blakesley]

I have clients that get nervous about casting in a noisy Wifi environment like a trade show. If we can tether a Quest to a PC, it eliminates a costly VR ready PC/ Rift setup. Tethering a Quest directly to a monitor would be even better. No need for a PC or Wifi. This would be a very simple setup and a big cost savings for clients who want multiple stations in a tradeshow booth.