Support arbitrary IR remote commands to Playbar.

I'd like it if playbar supported more programmable functions via IR remote. Many of us have universal remotes with unused/assignable buttons. Functions like: night mode, voice enhance, and music playback controls could all be assigned remote commands. The volume LED could be used to give some feedback for these states without having the sonos app open - E.g. one blink for on, two for off, etc... I know that simplicity is a hallmark of the Sonos system, but these could be added as optional 'power user' features.