The ansi target, txt table styles, kdesc reference from ref/, typeface and table-width fixes (from dev fcec5e2e77ac)

Since the previous release: Machine::read_string() (the fs::path/std::string
overload pair split); kdesc -c and -u rendered from the ref/ reflection
klammerset; a fit column's tex width measured in TeX over every entry;
@typeface resolving to the family its css declares (a store directory name
now works in html) and hieroglyphs in @unicode_examples set in their
typeface; the ansi target -- plain text with the type styles a terminal can
show, identical to txt once the escape sequences are stripped -- with the
txt @table carrying :header_style, :style and :hline; @block anchoring,
@table spacing and the Image_quality state variable; and the rewritten
doc/klammertext_for_llm.md.

sks/document/document_class.h

@@ -144,7 +144,12 @@ public:
     void collect_typefaces(const std::string& text);
     // html: the marker carries no inline switch (the span holds the family
     // name), so each is replaced by nothing.
-    std::string strip_typeface_markers(const std::string& text);
+    // html: each marker is replaced by the family name the store resolved
+    // its typeface to (the name as written may be the store's directory
+    // name, which no @font-face declares).
+    std::string resolve_typeface_families(const std::string& text);
+    // The resolved font for a typeface name as a @typeface wrote it.
+    const Resolved_font& resolved_typeface(const std::string& name) const;
     // tex: each distinct (typeface, scale) gets a \newfontfamily command in
     // the preamble; the marker is replaced by that command.
     std::string resolve_typeface_markers(const std::string& text);