If `smart` is not enabled, a command in the default template will
disable smartquote substitutions.
When `smart` is enabled, render curly apostrophes as straight
and escape straight apostrophes.
When `smart` is disabled, render curly apostrophes as curly
and don't escape straight apostrophes.
And similarly for quotes, em and en dashes.
This should give more idiomatic typst output, with fewer unnecessary
escapes.
Closes#10271.
