[WIP] Updated to Typst v0.12 and fixed string/content panics

[LordBaryhobal]

This PR bumps the Typst version used by the template to v0.12, as well as the latest versions of imported packages (codelst, showybox and acrostiche)

It fixes the new context warnings, improves some syntax formatting in the template itself, and fixes issues with figure captions. The latter was solved by removing eval calls in favor of letting the user pass content as parameters (title, sub-title, captions, etc.)

There are still some questions left:

• [x] Should the version be updated to 0.2.0 or 0.1.6 ? I saw that some issues are assigned to the 0.2.0 milestone (#10, #11)
• [ ] What about #15 ? Should it be implemented here or in a separate PR ?

[pmudry]

Regarding #15, it can be made here as well, even though I'd rather have more explicit names than tol``tofetc.

[pmudry]

Version can be bumped to 0.1.6 as the other features are still not implemented. In any case, thank you 👏🏻 very much @LordBaryhobal for the update. Once the PR has been merged and the latest points merged, I will then push to the official Typst repository.