Add pickling support

[LemurPwned]

Problem

Currently, none of the objects are pickle able.

Solution

Try to introduce pickle support through pybind11
https://pybind11.readthedocs.io/en/latest/advanced/classes.html#pickling-support

[LemurPwned]

Deepcopy support

https://pybind11.readthedocs.io/en/latest/advanced/classes.html#deepcopy-support