PHT Fixes

  Fix crash in 'Check for update'
  New Icons and Splash screen
  Workaround for 3FPS on Refresh Rate switching
  MyPlex queue optimizations
  Quit video playback when pressing esc on the OSD in paused mode.
  Support getting transcoder bitrates from other servers than the "best" one.
  Fix iOS client flinging Queue/Recommended videos
  Fix back button in VideoOSD
  Implement skipTo for pictures
  Don't show myPlex dialogs when we are not logged into myPlex.
  Close Audio/Subtitle pickers when we close the video window.
  Hide some pop-ups when playing video.
