CM2 Math1 SDK /release 5.6.0

• Major version. Due to changes in the API, client applications must be recompiled against the new headers.
• Lib names now end with _56 (Windows®), 5.6.0 with symlinks from 5.6 (Linux, macOS®).
• New builds with clang 20 and gcc 15.1 on Linux (Fedora 42).
• Visual Studio 2015 deprecated.

• The reserve/resize members of the base class cm2::vector_num (on which are based every CM2 Math1 dynamic containers) can now use std::is_trivially_default_constructible (when compiled with C++11 and above) to route more types to fast construction/destruction.

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