cppcheck: define Geant4 data types

Frank Winklmeierrequested to merge
fwinkl/athena:cppcheck_g4types into main

Teach cppcheck about the Geant4 POD types. This fixes missed defects as seen in !76465 (merged).

Also fix uncovered defects.

cc @sroe

Edited by Frank Winklmeier

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