feat: add utf8 format

- move utf8 stream and format patch from string to patch namespace.
- add ordinay format alias and utf8 format in our format patch.
- add char8_t and char inter-cast in string reinterpret namespace.
- fix bug of utf8 formatter.
- add test for utf8 format.

src/yycc/carton/clap/manual.hpp

@@ -0,0 +1,49 @@
+#pragma once
+#include "application.hpp"
+#include "../../macro/class_copy_move.hpp"
+#include "../tabulate.hpp"
+#include <iostream>
+
+#define NS_YYCC_CLAP ::yycc::carton::clap
+#define NS_YYCC_TABULATE ::yycc::carton::tabulate
+
+namespace yycc::carton::clap::manual::Manual {
+
+    struct ManualTr {
+    public:
+        ManualTr();
+        ~ManualTr();
+        YYCC_DEFAULT_COPY_MOVE(ManualTr);
+
+    public:
+        std::u8string author_and_version;
+        std::u8string usage_title, usage_body;
+        std::u8string avail_opt, avail_var;
+    };
+    
+    class Manual {
+    public:
+        Manual(const NS_YYCC_CLAP::application::Application& app, ManualTr&& trctx = ManualTr());
+        ~Manual();
+        YYCC_DEFAULT_COPY_MOVE(Manual);
+
+    private:
+        void setup_table();
+        void fill_opt_table();
+        void fill_var_table();
+
+    public:
+        void print_version(std::ostream& dst = std::cout) const;
+        void print_help(std::ostream& dst = std::cout) const;
+
+    private:
+        ManualTr trctx;
+        const NS_YYCC_CLAP::application::Application app;
+        NS_YYCC_TABULATE::Tabulate opt_printer;
+        NS_YYCC_TABULATE::Tabulate var_printer;
+    };
+
+}
+
+#undef NS_YYCC_TABULATE
+#undef NS_YYCC_CLAP