fix(core,meta): a folder of films is one title per film

The four Rebuild of Evangelion films in one folder were one series:
`- 1.11` read as episode 1, and every file took the folder's name, so
the whole folder matched a single film. A dash followed by a decimal is
now part of the film's name, and a folder whose files are all
unnumbered, outside any grouping folder and each named differently
gives each file its own title.

AniList needs every query word in a title, and a film's version number
is not in it, so a search that finds nothing is retried without it.
All four films now match their own entries.

docs/USER_GUIDE.md

@@ -46,12 +46,14 @@ The folder decides which show a file belongs to. The file name gives the season
 | `Bocchi the Rock/[Group] Bocchi the Rock - 07 [1080p].mkv` | Bocchi the Rock, episode 7 |
 | `Spy x Family/Season 2 - 06.mkv` | Spy x Family, season 2, episode 6 |
 | `Akira (1988).mkv` | A film, from 1988 |
+| `Rebuild of Evangelion/Evangelion - 1.11 You Are (Not) Alone.mkv` and three more | Four films, one title each |
 
 - Season folders can be called `Season 01`, `Season 1`, `S01` or `3rd Season`.
 - Folders such as `Specials`, `Extras`, `OVA`, `NCOP` or `Subs` are not taken as a show's name;
   the folder above them is.
 - An episode title is read only after a dash, as in `S01E01 - Name`.
-- A file with no episode number is a film.
+- A file with no episode number is a film. A folder of such files, each with a different name, is
+  one title per film.
 
 The app plays `mkv`, `mp4`, `m4v`, `avi`, `mov`, `webm`, `ts`, `m2ts` and most other common video
 containers.