Remove chumsky crate

[vinc]

• Rewrite INI parser with Nom
• Rewrite Brainfuck parser with Nom

[vinc]

Last year I tried to replace nom with chumsky for all my parsing needs.

I started by implementing a small Brainfuck interpreter in #750 then a INI config parser in #759 but for the spell command it turned out to be easier to write a hand parser than using chumsky.

I realized that I preferred nom better to keep the complexity low by combining many small functions. I should probably look into nom_locate to get back what I'll miss from chumksy but it turns out that I can do more than what I though to locate errors out of the box.