Minor updates to remove gcc warnings in cpp/doosabin/include/doosabin.h
Fix gcc errors in cpp/doosabin/include/doosabin.h
Update comments and documentation in cpp/doosabin/include/doosabin.h
Minor update to docstring in `raise_if_mesh_is_invalid` in subdivision/doosabin/doosabin.py
Minor update to docstring in subdivision/doosabin/doosabin_.pyx
Minor update to README.md