WIP

Fix #680

Notes

• Also modified the search during the imoprt to consider the release year, if present and the format (tv. / film) to only show more relevant items
• AniList's GDPR export only contains ids and coded info. After uploading the file, a series of requests are made to the public anilist API to retrieve names, release year and format (each request contains 50 items, so there is not much time waiting).
• Anilist has a media entry for each season. TMDB has one entry, with multiple seasons in it.
  This requires some modification in the search (in my personal list, more than 6% of items had a title finishing with "season n", which at very least interrupted the import process asking for user import, but often prevented the process from finding the correct result at all - e.g. "Attack on Titan Season 3" doesn't return the season 3 of the main series, but an unrelated movie).
  Some more conversion are also needed (all thoughts and tags get merged; status and ratings get applied to each season).