artifacts
Transition the project's build system from Autoconf to CMake,
streamlining the build process and conforming to modern C++ project
standards. Autoconf related files like 'configure', 'install-sh', and
'missing' have been removed while CMakeLists and relevant .cmake
configuration files are added to support the new system. This change
addresses the need for a more portable and easier-to-maintain build
system, particularly beneficial for cross-platform development. As a
result, build process customization and dependency management are
expected to be more straightforward.
Additionally, `.gitignore` has been adjusted to accommodate the CMake
build outputs. The new CMake build system introduces `build/` as the
directory for out-of-source builds, replacing the more scattered build
artifacts of the previous system.
