Take references where allowed and re-exports

[davxy]

• Take by reference where allowed (prevents clone in downstream users)
• Re-export fflonk and merlin as the user needs them anyway
• Propagate asm feature to ark-ff

[burdges]

LGTM. Just choose if you want to rexport form the root like people usually do, or use prelude because you always need both.

[burdges]

Isn't this redundant to edition=2021 ?

https://doc.rust-lang.org/edition-guide/rust-2021/default-cargo-resolver.html

[davxy]

Apparently not when you use a workspace:

warning: virtual workspace defaulting to `resolver = "1"` despite one or more workspace members being on edition 2021 which implies `resolver
 = "2"`
note: to keep the current resolver, specify `workspace.resolver = "1"` in the workspace root's manifest
note: to use the edition 2021 resolver, specify `workspace.resolver = "2"` in the workspace root's manifest
note: for more details see https://doc.rust-lang.org/cargo/reference/resolver.html#resolver-versions

[swasilyev]

Thanks!