Revert to passing matrices to/from C++ via uintptr_t's. #35
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This avoids any reliance on pybind11 in downstream packages; as long as they can take a uintptr_t, they can use mattress. We also introduce a BoundMatrix class inside a mattress.h header that can be used by downstreams to get the casting correct. GC protection is now fully handled in C++ via the BoundMatrix::original field.