See if we can have compile times stay low

[madig]

Found this very interesting article: https://matklad.github.io/2021/09/04/fast-rust-builds.html

This would be relevant for norad itself and for client code.

[madig]

Report for building norad, current git master: cargo-timing-20210908T212759Z.zip

So a large chunk goes to syn and serde's derive macros. Not sure that can be kept in check... Having plist use quick-xml instead of xml-rs eventually might help drop a few deps though.

[chrissimpkins]

That is a really nice report. How did you gen it?

[madig]

I followed https://matklad.github.io/2021/09/04/fast-rust-builds.html#profile-before-optimize. See https://doc.rust-lang.org/nightly/cargo/reference/unstable.html#timings.

[madig]

thiserror also pulls in syn, but adds very little compile time itself.