Remove py2 part from _23.py
Remove more mapped stuff.
Replace filter_iter with native filter.
Replace map_iter with native map.
Remove unidecode from _23 (empty wrapper on py3).
Remove map_list and replace with native list(map( for performance reasons.
Replace filter_list with list(filter.
Replace list_keys with list(.
Replace list_values with list(...values()).
Replace list_items with list(....items()).
Replace ordered_dict with dict.
Fix tvinfo base type docs.
Remove py2 parts from sg_futures.
Remove scandir lib ... it's a sub module of os in py3.
Remove PY2 stuff.
Ignore unknown ids for characters/persons.
Fix tvdb image parsing.
Ignore unknown id sources on person page.
