[ABW]: get_blacklists_for_observer renamed get_blacklisted_for_observer since...

[ABW]: get_blacklists_for_observer renamed get_blacklisted_for_observer since that's what is in results
new get_blacklists_for_observer added that returns list of blacklists/mute lists for observer
get_relationship_between_accounts supplemented with new field: follows_muted
[Fix] does_user_follow_any_lists works properly again (broken by previous commit)