Added numbat-wasm back to workspace

[rben01]

Fixed resulting clippy errors

[sharkdp]

Thank you. We now get this cargo warning when running cargo build / cargo run:

warning: profiles for the non root package will be ignored, specify profiles at the workspace root:
package:   /home/shark/numbat/numbat-wasm/Cargo.toml
workspace: /home/shark/numbat/Cargo.toml

It's probably caused by this profile in numbat-wasm/Cargo.toml:

[profile.release]
# Tell `rustc` to optimize for small code size.
opt-level = "s"
lto = true

but I'm not sure if moving that to the workspace root is really the best idea? Maybe we would have to rename (release-wasm) and then refer to that explicitly in our build scripts?

[rben01]

Hmm, not sure how to fix this. rust-lang/cargo#8264

Mucking with the package layout just to fix this one warning doesn't seem worth it... I wonder if there's a workaround.