Replace glob imports (`use super::*`, `use crate::*`, `use sig::*`) with
the names each file uses, in scriptcheck, pdf, render, text and ui-egui.
No code changes.
Move the declaration pass, the significant-token helpers and the feature
recognisers into analyze/declared.rs, sig.rs and features.rs without
changing their code, and replace the duplicated line-break and directive
dispatch of scan and declarations with LineBreaks::read.
Part of #4014
Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>
bflatastic