Use xdg-open if present, instead of guessing firefox.

source/system/split_string.hpp

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+/*
+ *	The Deploy Implementation
+ *	Nana C++ Library(http://www.nanapro.org)
+ *	Copyright(C) 2003-2018 Jinhao(cnjinhao@hotmail.com)
+ *
+ *	Distributed under the Boost Software License, Version 1.0.
+ *	(See accompanying file LICENSE_1_0.txt or copy at
+ *	http://www.boost.org/LICENSE_1_0.txt)
+ *
+ *	@file: nana/system/split_string.hpp
+ *
+ *	What follows is dependent on what defined in nana/config.hpp
+ */
+
+#ifndef NANA_SYSTEM_SPLITSTRING_HPP
+#define NANA_SYSTEM_SPLITSTRING_HPP
+
+#include <nana/config.hpp>
+#include <vector>
+#ifdef _nana_std_has_string_view
+#	include <string_view>
+#else
+#	include <string>
+#endif
+
+namespace nana
+{
+namespace system
+{
+#ifdef _nana_std_has_string_view
+typedef std::string_view split_string_type;
+#else
+typedef std::string split_string_type;
+#endif
+
+std::vector<split_string_type> split_string (const split_string_type& text, char sep);
+
+}
+}
+
+#endif