rename old/porting/optional.hpp into optional.h #1628
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Currently, SDK requires C++11 minimum.
So, boost::optional type is used for optional values. For C++17 and above more convenient is to use std::optional instead. The task NLAM-23 is about making this type configurable. This commit is a renaming of the initially proposed "optional.hpp" into optional.h to avoid clang-format header sorting issue.
Relates-To: NLAM-23