Add gulrak/filesystem

src/shared/nonstd/filesystem.h

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+#ifndef NONSTD_FILESYSTEM_BACKPORT_H
+#define NONSTD_FILESYSTEM_BACKPORT_H
+
+#include "./ghc-filesystem-cpp11-backport/filesystem.hpp"
+
+namespace nonstd { namespace filesystem {
+    using namespace ghc::filesystem;
+    using ifstream = ghc::filesystem::ifstream;
+    using ofstream = ghc::filesystem::ofstream;
+    using fstream = ghc::filesystem::fstream;
+}} // namespace nonstd::filesystem
+
+#endif // NONSTD_FILESYSTEM_BACKPORT_H

src/shared/nonstd/ghc-filesystem-cpp11-backport/LICENSE

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+Copyright (c) 2018, Steffen Schümann <[email protected]>
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

src/shared/nonstd/ghc-filesystem-cpp11-backport/README.md

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+# gulrak/filesystem
+
+> An implementation of C++17 std::filesystem for C++11 /C++14/C++17/C++20 on Windows, macOS, Linux and FreeBSD.
+
+It is used in MaNGOS to allow for an easy filesystem interface without writing everything by ourselves and each OS.  
+It aims to be a drop-in-replacement for the official standard, which means if this project upgrades to a newer C++ version, it can be easily exchanged.
+
+## Source
+Commit: https://github.com/gulrak/filesystem/commit/b1982f06c84f08a99fb90bac43c2d03712efe921  
+Date: 2024-04-27T10:20:18Z
+
+## Copied files
+```
+include/*
+LICENSE.txt
+```