STYLE: Prefer = default to explicitly trivial implementations
STYLE: Prefer = default to explicitly trivial implementations

This check replaces default bodies of special member functions with
= default;. The explicitly defaulted function declarations enable more
opportunities in optimization, because the compiler might treat
explicitly defaulted functions as trivial.

Additionally, the C++11 use of = default more clearly expreses the
intent for the special member functions.

thewtex/ITKCuberille,InsightSoftwareConsortium/ITKCuberille,InsightSoftwareConsortium/ITKCuberille,InsightSoftwareConsortium/ITKCuberille,thewtex/ITKCuberille,thewtex/ITKCuberille