Decode QR code(s) from images using the OpenCV/WeChat library via XS

Changes for 2.0 - 2024-03-08

• Major change: replaced sub names 'decode' with 'detect_and_decode_qr' : reason was that decode() clashes with Encode::decode(). Major change: replaced sub names 'decode_xs' with 'detect_and_decode_qr_xs'. Major change: output files are now in XML and JPEG formats. Added more tests. Enhnaced the highgui detection procedure with 2 more methods. Replaced CPAN Ratings link in POD with a link to PerlMonks' Module Review in order to settle issue https://rt.cpan.org/Public/Bug/Display.html?id=147894 Documentation enchancments.