Move all std related headers to "include_std"

include_std/std/utility.hpp

@@ -0,0 +1,39 @@
+/*
+   This file is part of Fennix Kernel.
+
+   Fennix Kernel 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.
+
+   Fennix Kernel 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 Fennix Kernel. If not, see <https://www.gnu.org/licenses/>.
+*/
+
+#ifndef __FENNIX_KERNEL_STD_UTILITY_H__
+#define __FENNIX_KERNEL_STD_UTILITY_H__
+
+#include <types.h>
+
+namespace std
+{
+    template <typename T1, typename T2>
+    struct pair
+    {
+        typedef T1 first_type;
+        typedef T2 second_type;
+
+        T1 first;
+        T2 second;
+
+        pair() : first(T1()), second(T2()) {}
+        pair(const T1 &x, const T2 &y) : first(x), second(y) {}
+    };
+}
+
+#endif // !__FENNIX_KERNEL_STD_UTILITY_H__