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.cpp

@@ -482,25 +482,25 @@ void Machine::read(const fs::path& pathname)
     // :cpp libraries live next to the file that uses them).
     m_state.add_search_dir(fs::absolute(pathname).parent_path().string());
     m_state.open_frame("Machine state: " + pathname.string());
-    std::string text = m_state.subst(trim_right(string_from_file(pathname)));
-    katom_list katoms = process(text, pathname);
-    m_katoms.insert(m_katoms.end(), katoms.begin(), katoms.end());
-    extract_machine_definitions();
-    extract_klammer_definitions();
+    input(string_from_file(pathname), pathname.string());
     m_sources.push_back(pathname);
 }
 
-void Machine::read(const std::string& s)
+void Machine::read_string(const std::string& text)
 {
-    (void)K::log(3, s);
-    m_state.open_frame("Machine state: " + s);
-    std::string text = m_state.subst(trim_right(s));
-    katom_list katoms = process(text, command_pathname);
+    (void)K::log(3, text);
+    m_state.open_frame("Machine state: " + text);
+    input(text, command_pathname);
+    m_sources.push_back(text);
+}
+
+void Machine::input(const std::string& text, const std::string& source)
+{
+    katom_list katoms = process(m_state.subst(trim_right(text)), source);
     m_katoms.insert(m_katoms.end(), katoms.begin(), katoms.end());
     extract_machine_definitions();
     extract_klammer_definitions();
-    m_sources.push_back(s);
-}    
+}
 
 // Read