Sturdy up the API and add PDF417

[Caellian]

I started adding PDF417 utility method, and then did a few other things. One day later:

• Allowed passing Options to Zint.
  • A lot of codes weren't constructible previously because they require additional configuration.
• Added utility functions for configuration.
  • This makes it easier and safer to use right Options values.
• Documented majority of barcode encoders in the manual.
• Replaced anyhow with thiserror to provide descriptive error messages.
  • Old ones were a single word that would be a pain to pin down in a lot of normal use cases.
• Removed some unused derives to speed up compilation.
  • e.g. Options don't need Serialize as they'll never be passed back to typst; Errors almost never require Clone and Copy, and adding them imposes restrictions that can't be satisfied in a lot of cases; ...
• Moved simple functions to typst and used composition to reduce code complexity.
• Marked Symbology as #[non_exhaustive] in bindings as it depends on Zint values.
  • Doesn't affect the current code, but ensures that future code will have to handle any unimplemented values in some way, in case Zint updates and the bindings don't (yet).
• Made Options fields public to allow testing and Options default constructible to simplify use from Rust code.
  • I faced some weird errors while trying to use Zint (my fault), so I tried writing tests and it was impossible to do so, so I fixed the API a little.
• Added a few constants to lib.typ to allow dependants to use named values instead of magic numbers.
  • I think these are mostly fine, but I'm not sure what DM_ISO_144 and ULTRA_COMPRESSION do so I just left them in case they're needed.
• Fixed errors copying Options strings into C buffers.
  • Previously used copy_from_slice expected source and destination buffers to be of same size which caused the library to panic when any of the string options were set.
• Add more flexible Color deserialization logic.
  • The field can now deserialize form a hex string, or a byte array, or a dictionary.
• Turned Option3 into an union so that it matches Zint better - the actual meaning of the value is determined by the Options object.
• Added more flexible Option3 deserialization - accepts either a valid int value (any of) or a textual representation.
• Made enum discriminants match the values they were representing.
  • This makes it very easy to do typst-rust-c conversion in any direction and makes things more consistent.
  • Used serde aliases to handle legacy names so this part is still backwards compatible.
• Use hex crate for faster Color conversion.
  • hex was needed for parsing/deserializing the colors, so I used it for string generation as well as it's faster and generates less code than std format! macro.
• Added a table with Options names and values to the manual so people can look it up there instead of having to look at the sources.

This closes #1.

Future Work

• I left some more complicated barcodes commented out in the docs, they should be documented at some point, but it's a lot of work tracking down all the details and I'm short on time atm.
  • I made sure to include one of them anyway for reference.
• I left a few TODO comments in places where I didn't know what to do.

[Enter-tainer]

looks cool! i'm busy with work these days but i will take a look within a week. thank you for such a big improvement!

[Caellian]

You're welcome. Let me know if there's any change you don't like or want more info on when you get at it.

[Enter-tainer]

LGTM, this is definitely a huge improvement to this packge!

[Enter-tainer]

thank you! i will publish a new version when i leave work