WIP: makes 'Gather' const
Makes the 'Gather' method of sensitive detectors const to prepare for the reentrancy of AtlasG4Alg in !26916 (closed).
In addition 'getSD' in the base class needs to be const.
Makes the 'Gather' method of sensitive detectors const to prepare for the reentrancy of AtlasG4Alg in !26916 (closed).
In addition 'getSD' in the base class needs to be const.