Can now install with CMake and pip

[ThisIsNotANamepng]

As a result of my research with Dr. amethyst, bertini2 can now be built with CMake, and pybertini can then be installed with pip.

[ofloveandhate]

There's a bit to do yet, but this worked on my M1 Mac. The gaps I see right now:

• some of the test suites in the core are not built. the sources are listed, but the executables are not created. should be simple to fix.
• 🤔

[ofloveandhate]

• all core tests are represented
• built easily on my m3 mac just now as-is.