Updater: Prep for more streamlined update process

* Nuke out unused channel selector receiver
* UpdateCheckReceiver now handles all checking of if UpdateInfo exists and the resetting of it.
     if a new build is found
* All builds pulled through this Updater will be 'Stable', meaning vetted thoroughly via a QA
      process
* Leaving 'Beta' and 'Testing' as an optional compilable channel, for soak testing down the road
Signed-off-by: Brandon McAnsh <brandonm@matricom.net>