Rewriting some python code in C++ to speed it up #28
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This PR rewrites functions with high computational costs, such as coordinate transformations and equations of motion, in C++, and then makes it possible to call them from python codes using pybind11.
Note that this change eliminates the dependency on Numba, but instead introduces a dependency on pybind11, and that the C++ codes must be compiled using the make command before executing GELATO itself.