LHCbMath Add fast approximate atan2 for scalars and SIMD types.
Also a drive by C++17 cleanup and formatting of Kernel/LHCbMath/LHCbMath/FastMaths.h.
Calling Open Source developers! Join the CERN OSPO launch event on Wed Nov 29th! https://cern.ch/ospo-2
Also a drive by C++17 cleanup and formatting of Kernel/LHCbMath/LHCbMath/FastMaths.h.