Optional: Move optional-lite to the include/third-party directory

This fixes the use case of adding the include folder
manually to an outside project.

include/icsneo/third-party/optional-lite/test/optional-main.t.hpp

@@ -0,0 +1,50 @@
+// Copyright (c) 2016 Martin Moene
+//
+// https://github.com/martinmoene/optional-lite
+//
+// Distributed under the Boost Software License, Version 1.0.
+// (See accompanying file LICENSE.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+
+#pragma once
+
+#ifndef TEST_OPTIONAL_LITE_H_INCLUDED
+#define TEST_OPTIONAL_LITE_H_INCLUDED
+
+#include "nonstd/optional.hpp"
+
+// Compiler warning suppression for usage of lest:
+
+#ifdef __clang__
+# pragma clang diagnostic ignored "-Wstring-conversion"
+# pragma clang diagnostic ignored "-Wunused-parameter"
+# pragma clang diagnostic ignored "-Wunused-template"
+# pragma clang diagnostic ignored "-Wunused-function"
+# pragma clang diagnostic ignored "-Wunused-member-function"
+#elif defined __GNUC__
+# pragma GCC   diagnostic ignored "-Wunused-parameter"
+# pragma GCC   diagnostic ignored "-Wunused-function"
+#endif
+
+#include <iosfwd>
+namespace lest { template<typename T> std::ostream & operator<<( std::ostream & os, nonstd::optional<T> const & v ); }
+
+#include "lest_cpp03.hpp"
+
+#define CASE( name ) lest_CASE( specification(), name )
+
+extern lest::tests & specification();
+
+namespace lest {
+
+template< typename T >
+inline std::ostream & operator<<( std::ostream & os, nonstd::optional<T> const & v )
+{
+    using lest::to_string;
+    return os << "[optional:" << (v ? to_string(*v) : "[empty]") << "]";
+}
+
+} // namespace lest
+
+#endif // TEST_OPTIONAL_LITE_H_INCLUDED
+
+// end of file