Rename tawashi to duckbin.

The library that used to be "tawashi_implem" now
is simply called tawashi.

src/tawashi/ip_utils.hpp

@@ -0,0 +1,29 @@
+/* Copyright 2017, Michele Santullo
+ * This file is part of "tawashi".
+ *
+ * "tawashi" is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * "tawashi" is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with "tawashi".  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#pragma once
+
+#include "duckhandy/compatibility.h"
+#include <string>
+
+namespace tawashi {
+	namespace cgi {
+		class Env;
+	} //namespace cgi
+
+	std::string guess_real_remote_ip (const cgi::Env& parCgiEnv) a_pure;
+} //namespace tawashi