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.cpp

@@ -0,0 +1,69 @@
+#include "manual.hpp"
+#include "../termcolor.hpp"
+#include "../../patch/stream.hpp"
+#include "../../string/op.hpp"
+
+#define CLAP ::yycc::carton::clap
+#define TABULATE ::yycc::carton::tabulate
+#define TERMCOLOR ::yycc::carton::termcolor
+#define OP ::yycc::carton::op
+
+using namespace ::yycc::patch::stream;
+
+namespace yycc::carton::clap::manual::Manual {
+
+#pragma region Manual Translation
+
+    ManualTr::ManualTr() :
+        author_and_version(u8"Invented by {0}. Version {1}."), usage_title(u8"Usage:"), usage_body(u8"{0} <options> ..."),
+        avail_opt(u8"Available options:"), avail_var(u8"Available environment variables:") {}
+
+    ManualTr::~ManualTr() {}
+
+#pragma endregion
+
+#pragma region Manual
+
+    using Application = CLAP::application::Application;
+    using Tabulate = TABULATE::Tabulate;
+
+    Manual::Manual(const Application &app, ManualTr &&trctx) : trctx(std::move(trctx)), app(app), opt_printer(3), var_printer(2) {
+        this->setup_table();
+        this->fill_opt_table();
+        this->fill_var_table();
+    }
+
+    Manual::~Manual() {}
+
+    void Manual::setup_table() {
+        this->opt_printer.show_header(false);
+        this->opt_printer.show_bar(false);
+        this->opt_printer.set_prefix(u8"    ");
+
+        this->var_printer.show_header(false);
+        this->var_printer.show_bar(false);
+        this->var_printer.set_prefix(u8"    ");
+    }
+
+    void Manual::fill_opt_table() {
+        const auto &options = app.get_options();
+        for (const auto &reg_opt : options.all_options()) {
+            const auto &opt = reg_opt.get_option();
+        }
+    }
+
+    void Manual::fill_var_table() {}
+
+    void Manual::print_version(std::ostream &dst) const {
+        const auto &summary = this->app.get_summary();
+
+        dst << std::format
+        dst << summary.get_description() << std::endl;
+        dst << std::endl;
+    }
+
+    void Manual::print_help(std::ostream &dst) const {}
+
+#pragma endregion
+
+} // namespace yycc::carton::clap::manual::Manual