This commit increase warning level from `W3` to `W4` on MSVC and sets
warnings as errors. Exclusion is made for a specific warning (C4189).

Using `-pedantic` threw warnings on `g++`. This commit cleans up those
warnings.

This commit adds an option to build using CMake by adding
CMakeLists.txt. CMake builds are consistent with the builds currently
produced.

For Linux build, CPack produces artifacts consistent with the current
RPM specification.

CMake is also added to the CI pipeline in main.yml.