• Migration to OpenSSL 3.0 API (based on PR by @snargit). Note that OpenSSL engines are disabled by default when XMLSec library is compiled against OpenSSL 3.0. To re-enable OpenSSL engines, use "--enable-openssl3-engines" configure flag (there will be a lot of deprecation warnings).
• The OpenSSL before 1.1.0 and LibreSSL before 2.7.0 are now deprecated and will be removed in the future versions of XMLSec Library.
• Refactored all the integer casts to ensure cast-safety. Fixed all warnings and enabled "-Werror" and "-pedantic" flags on CI builds.
• Added configure flag to use size_t for xmlSecSize (currently disabled by default for backward compatibility).
• Moved all CI builds to GitHub actions.