Python bindings update - 2D support, C-API deprecation fix#32

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dnbaker wants to merge 2 commits intoFALCONN-LIB:masterfrom

Commits on Dec 8, 2021

Switch from C-Python API to Pybind11 to use one version for all Python versions
dnbaker
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Add 2D support to FFHT, along with parallelization across rows. Adds OpenMP compilation requirement.
dnbaker
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