Use default allocator instead of wee_alloc in numbat-wasm

[triallax]

Crate has major unresolved issues such as memory leaks (rustwasm/wee_alloc#106). Its last commit at the moment was made shy of 3 years ago, and the latest release is over 4 years old. I see no reason to keep using it in light of this.

Note: untested

[sharkdp]

The main reason for using wee_alloc is the file size of the WASM output. How much bigger is the generated file?

[eminence]

Unless I'm doing something wrong, the wee_alloc build is 270 bytes bigger

achin@bbx in numbat/numbat-wasm (4efd0ea) is 📦 v0.1.0 🦀 
❯ ls -l www/pkg/
total 435
-rw-r--r-- 1 achin achin 870347 Jan 28 02:13 numbat_wasm_bg.wasm
-rw-r--r-- 1 achin achin   1496 Jan 28 02:13 numbat_wasm_bg.wasm.d.ts
-rw-r--r-- 1 achin achin   3410 Jan 28 02:13 numbat_wasm.d.ts
-rw-r--r-- 1 achin achin  12237 Jan 28 02:13 numbat_wasm.js
-rw-r--r-- 1 achin achin    309 Jan 28 02:13 package.json
-rw-r--r-- 1 achin achin    221 Jan 28 02:13 README.md

achin@bbx in numbat/numbat-wasm (053e08d) is 📦 v0.1.0 🦀 took 15s 
❯ ls -l www/pkg/
total 435
-rw-r--r-- 1 achin achin 870077 Jan 28 02:15 numbat_wasm_bg.wasm
-rw-r--r-- 1 achin achin   1496 Jan 28 02:14 numbat_wasm_bg.wasm.d.ts
-rw-r--r-- 1 achin achin   3410 Jan 28 02:14 numbat_wasm.d.ts
-rw-r--r-- 1 achin achin  12237 Jan 28 02:14 numbat_wasm.js
-rw-r--r-- 1 achin achin    309 Jan 28 02:15 package.json
-rw-r--r-- 1 achin achin    221 Jan 28 02:15 README.md

[sharkdp]

Weird. I also tested it and the numbat_wasm_bg.wasm file has 872,448 bytes before and after. This matches neither of your numbers. Might be a difference in compiler/wasm-pack?

▶ rustc --version
rustc 1.75.0 (82e1608df 2023-12-21)

~                                                                                                                             
▶ wasm-pack --version
wasm-pack 0.12.1

In any case... I think we can move forward with this PR and merge it. Numbat can potentially be a long-running application, so probably we shouldn't use an allocator that's leaking memory :-)