Adding upstream version 18.2.2.upstream/18.2.2

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

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+# LEAF
+
+> A lightweight error handling library for C++11.
+
+## Documentation
+
+https://boostorg.github.io/leaf/
+
+## Features
+
+* Portable single-header format, no dependencies.
+* Tiny code size when configured for embedded development.
+* No dynamic memory allocations, even with very large payloads.
+* Deterministic unbiased efficiency on the "happy" path and the "sad" path.
+* Error objects are handled in constant time, independent of call stack depth.
+* Can be used with or without exception handling.
+
+## Support
+
+* [cpplang on Slack](https://Cpplang.slack.com) (use the `#boost` channel)
+* [Boost Users Mailing List](https://lists.boost.org/mailman/listinfo.cgi/boost-users)
+* [Boost Developers Mailing List](https://lists.boost.org/mailman/listinfo.cgi/boost)
+
+## Distribution
+
+Besides GitHub, there are two other distribution channels:
+
+* LEAF is included in official [Boost](https://www.boost.org/) releases, starting with Boost 1.75.
+* For maximum portability, the library is also available in single-header format: simply download [leaf.hpp](https://boostorg.github.io/leaf/leaf.hpp) (direct download link).
+
+Copyright 2018-2022 Emil Dotchevski and Reverge Studios, Inc. Distributed under the http://www.boost.org/LICENSE_1_0.txt[Boost Software License, Version 1.0].