disable preferences in home menu

causes problems with grid view on roku—preferences still available in
Plex web interface
shorten channel title

prevents Roku breadcrumb being truncated
use local time for originally_available_at

MythTV uses UTC, but Plex expects originally_available_at to be in
local time.
shorten root folder titles
move Groups folder to top
move All Recordings folder to top
add root folder icons
add a ViewGroup
add cover art and fanart
add season and episode numbers
add year (only when no season/episode)
add category and channel
add video_resolution
return a MovieObject instead of a VideoClipObject
adjust MovieObject constructor indentation
remove newlines at ends of warnings
use ContentsOfURLWithFallback for screenshot
import urllib (fixes coverart/fanart)
add tagline
use ContainerContent.Shows