SWIG-4.1.0 released

SWIG-4.1.0 summary:

• Add Javascript Node v12-v18 support, remove support prior to v6.
• Octave 6.0 to 6.4 support added.
• Add PHP 8 support.
• PHP wrapping is now done entirely via PHP's C API - no more .php wrapper.
• Perl 5.8.0 is now the oldest version SWIG supports.
• Python 3.3 is now the oldest Python 3 version SWIG supports.
• Python 3.9-3.11 support added.
• Various memory leak fixes in Python generated code.
• Scilab 5.5-6.1 support improved.
• Many improvements for each and every target language.
• Various preprocessor expression handling improvements.
• Improved C99, C++11, C++14, C++17 support. Start adding C++20 standard.
• Make SWIG much more move semantics friendly.
• Add C++ std::unique_ptr support.
• Few minor C++ template handling improvements.
• Various C++ using declaration fixes.
• Few fixes for handling Doxygen comments.
• GitHub Actions is now used instead of Travis CI for continuous integration.
• Add building SWIG using CMake as a secondary build system.
• Update optional SWIG build dependency for regex support from PCRE to PCRE2.