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.

ref/reflect.cpp

@@ -53,3 +53,65 @@ std::string extended_latin_examples([[maybe_unused]] Machine& machine)
     return kt.str();
 }
 
+
+extern "C"
+std::string pinyin_examples([[maybe_unused]] Machine& machine)
+{
+    std::stringstream kt {};
+    kt << "@table :caption Mandarin pinyin tones (using vowel ``a'') :cell_hpos c c l |\n"
+       << "   @i-Displayed | @i-Written | @i-Name ||\n";
+
+    for (auto [symbol, codename] : pinyin_tones) {
+        auto [code, name] = codename;
+        std::string literal = "^a" + symbol;
+        kt << literal << " | @t ^" << literal << " @ | " << name << " ||\n";
+    }
+    kt << "table@";
+    return kt.str();
+}
+
+extern "C"
+std::string unicode_examples([[maybe_unused]] Machine& machine)
+{
+    std::stringstream kt {};
+    kt << "\n@b Including Unicode in Klammertext files @\n\n"
+       << "To specify a wide variety of different letter forms, the Unicode Standard "
+       << "defines a large set of \"code points\" organized by groups.  To include a "
+       << "Unicode character in Klammertext, you surround its hexadecimal number with "
+       << "the \"^^\" character. For example, the Cyrillic captial letter \"I\" is \"И\", "
+       << "included in Klammertext as ^^0418^^.\n\n"
+       << "To search for Unicode characters by their description, see: @nl@\n"
+       << "@link https://www.fileformat.info/info/unicode/char/search.htm @\n\n";
+
+    kt << "@table :caption Examples of Chinese characters :cell_hpos c |\n"
+       << " Character | Unicode | Pinyin ||\n";
+
+    for (auto chr : dao) {
+        std::string code = "^" + chr[1] + "^";
+        kt << process_unicode_codepoint(code) << " | "
+           << "^" << code << "^" << " | "
+           << chr[0] << " ||\n";
+    }
+    kt << "table@\n\n";
+
+
+    kt << "@table :caption Examples of Egyptian hieroglyphs :cell_hpos c c c l |\n"
+       << "Hieroglyph | Unicode | Sound | Gardiner ||\n";
+
+    // The body font carries no hieroglyphs, so the glyph names the
+    // typeface it needs (shipped in fnt/); @document declares and localizes
+    // it.  Under txt @typeface passes the text through unchanged.
+    for (auto glyph : ptolemy) {
+        kt << "@typeface noto-sans-egyptian-hieroglyphs :scale 1.5 | "
+           << process_unicode_codepoint("^" + glyph[2] + "^") << " @ | "
+                  << "^^" + glyph[2] + "^^ | "
+                  << glyph[1] << " | "
+                  << glyph[0] << " ||\n";
+    }
+    kt << "table@\n\n"
+       << "\nIn @link https://en.wikipedia.org/wiki/List_of_Egyptian_hieroglyphs @, "
+       << "the Unicode codepoint in the second column of the \"List of hieroglyphs\" "
+       << "table is the number in the ^^...^^ code used by Klammertext.\n\n";
+
+    return kt.str();
+}