track: Add offline_status property
track: Add availability property
track: Add is_local property
track: Check session and error before returning name
track: Add is_autolinked property
track: Add playable property
track: Add is_placeholder property
track: Add is_starred property
track: Remove uneccessary session checks
track: Add album property
track: Add duration property
track: Add popularity property
track: Add disc property
track: Add index property
docs: Update dev status