Support for base62?

[LimiteKNJ]

Although most BMS Patterns are still being developed mainly around Base36 (0-9, A-Z), since last year some BMS Patterns have stopped optimizing for key sounds and are instead using a Base62 (0-9, a-z, A-Z) system that produces key sounds more loosely, and this is gradually starting to appear.

Since recent BMS player (beatoraja, openLR2) are supporting it,
it seems like this could work in some way if I just remove tolowercase part as well. Would that be possible.

• For Example, this bms made from base62.
  https://manbow.nothing.sh/event/event.cgi?action=More_def&num=362&event=149

[dtinth]

@LimiteKNJ Hi, this would be a nice addition. Thanks for raising this. I had my agent implement it but did not have time to test the result yet (I skimmed the code and it looks okay).

Can you try this preview build and let me know if it is working? https://previews.bemuse.ninja/pr-861/index.html

[LimiteKNJ]

I briefly tried it with the example file yesterday, and it seems there are no playback issues.
I think I need to look up and test other base62 bms files as well For the time being.