New API, code modernization, performance improvements

This version brings updates in the API, making it very easy to take
advantage of all BRKGA-MP-IPR features at once. This is accomplished by
method run(), and the new control parameters, which now can persist in
the configuration file together with the algorithm parameters. We also
modernized the code to C++20 with some performance gains. The
documentation was enhanced and now covers 100% of the code.