Improvements for the /mappers page

[n3tman]

I'll just document here what might be improved and you tell me what's doable and what's a definite no-no.
All low priority, I don't expect this to be added anytime soon (but maybe eventually).
Reference page: https://n3tman.github.io/TopMappers/

Features to consider for https://beatsaver.com/mappers

1. Sorting - to find people with most maps, dislikes, mapping age, etc.
2. Basic text filtering - to find yourself in the list, find people who started in 2021, etc.
3. Advanced filtering - similar to how tablesorter widget works. Most wanted part: comparison operators.
   • E.g. find rows where First Upload is >=2020, Total Maps is >2, Ranked Maps =0.
   • Can be used to find interesting mappers based on data.
4. [ScoreSaber] New column: Total number of plays on all difficulties.
   • I know it's not the best metric, but it's better than downloads.
5. [BSaber] Link to a BSaber profile, like https://bsaber.com/members/<uploader.name>
   • Helps to know more about the mapper since some people have detailed pages there.
6. [BSaber] New column: Number of maps recommended by curators.
   • This wp-json endpoint can be used to find map keys.
7. [BSaber] New column: Number of playlists where maps have been featured.
   • This playlistAPI file can be used to find playlist links. They can be downloaded and map keys can be extracted/compared (all files have key values).
   • Would be great to have a popup with names/links to these playlists too, similar to TopMappers. I had to add URLs of playlists manually though, but they can be added to playlistAPI file.
8. [UI] Alternate colors for rows + highlight row on hover
9. [UI] Thousand separators for numbers. E.g. 286,190 or 286 190 (thin space) instead of 286190.
   • Might be added globally to individual mapper pages as well (in stats block).

[helencarnate]

Review carefully before implementing any this. Many of the "Bsaber" requests are no longer valid (or won't be valid as soon as we work on the rewrite). I have removed the "invalid" label and substituted with this comment.