CMAKE based building infra

[are-scenic]

Having some a discussion with some active users of STAT and adding support to a newer version MSVC, we came to an idea that perhaps it's time to improve the building infrastructure. We discussed that having CMAKE as a base framework will make it more maintainable, enhanced and convenient. This claims is based on the fact that CMAKE is meta-building framework that is constantly being developed and adjusted not only with some useful features, but also as a response to new build tool-chains being published.
For instance, with CMAKE adding a support for newer MSVC would have not required any updates on side of STAT, as it would be only a matter of downloading a newer version of CMAKE that already has this support.

[are-scenic]

It was also reiterated that with the new CMAKE infra, we still would like to support the old format of STAT mak-files, which would be simply translated to CMakeLists.txt files under the hood.