Consider moving away from Boost

[nnarain]

It seems like Boost is the source of a few issues with regards to the usability of this project.

• A not so straightforward build
• Distribution of the binaries

As mentioned in this pull request: https://github.com/nnarain/gameboycore/pull/132

I could use pybind11 or something else that is more minimal then Boost.Python to build the module.

[nnarain]

https://pybind11.readthedocs.io/en/master/compiling.html#building-with-cmake

[nnarain]

Fully ported to pybind11, seems everything is in order.