- Switched back to custom window management, taking another stab

- Refactored lang yet again, `fennec/lang` is now C++ language. `fennec/string` `fennec/filesystem` and `fennec/format` are now independent.

test/tests/test_format.h

@@ -0,0 +1,56 @@
+// =====================================================================================================================
+//  fennec, a free and open source game engine
+//  Copyright © 2025  Medusa Slockbower
+//
+//  This program 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.
+//
+//  This program 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 this program.  If not, see <https://www.gnu.org/licenses/>.
+// =====================================================================================================================
+
+///
+/// \file test_format.h
+/// \brief
+///
+///
+/// \details
+/// \author Medusa Slockbower
+///
+/// \copyright Copyright © 2025 Medusa Slockbower ([GPLv3](https://www.gnu.org/licenses/gpl-3.0.en.html))
+///
+///
+
+#ifndef FENNEC_TEST_LANGPROC_FORMAT_H
+#define FENNEC_TEST_LANGPROC_FORMAT_H
+
+#include "../test.h"
+#include <fennec/format/format.h>
+
+namespace fennec
+{
+
+namespace test
+{
+
+inline void fennec_test_format() {
+
+	fennec_test_run(fennec::format("{}",      "Hello World!"),    string("Hello World!"));
+	fennec_test_run(fennec::format("{0}",     "Hello World!"),    string("Hello World!"));
+	fennec_test_run(fennec::format("{0} {0}", "Hello"),           string("Hello Hello"));
+	fennec_test_run(fennec::format("{0} {1}", "Hello", "World!"), string("Hello World!"));
+	fennec_test_run(fennec::format("{1} {0}", "Hello", "World!"), string("World! Hello"));
+}
+
+}
+
+}
+
+#endif // FENNEC_TEST_LANGPROC_FORMAT_H