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.

mac/machine.h

@@ -69,8 +69,15 @@ public:
         bool nonascii=true, bool literal=true, bool ignore=true, bool whitespace=true,
         bool klammers=true, bool eval=true, bool cond=true, bool read=true);
 
-    void read(const fs::path& pathname);
-    void read(const std::string& s);
+    // Two ways to give the Machine its input. They are named, not
+    // overloaded: fs::path and std::string convert into each other freely
+    // enough that a string literal is ambiguous between them and a
+    // std::string holding a filename silently selects the text reading.
+    void read(const fs::path& pathname);       // the file's contents
+    void read_string(const std::string& text); // the string itself
+    // What both do once they have the text: substitute, katomize, extract
+    // definitions. `source` names where the text came from in messages.
+    void input(const std::string& text, const std::string& source);
 
     void expand_read_katoms(
         std::vector<Katom>& katoms, std::string source_filename,