hecl/hecl: Mark byte swapping functions as noexcept
hecl/hecl: Mark byte swapping functions as noexcept

These are frequently used within hash implementations, which should be
noexcept by default. Given it doesn't make sense to throw exceptions
from these functions anyways, they can be made noexcept.

AxioDL/PathShagged,AxioDL/PathShagged,AxioDL/PathShagged