Refactor ParameterBase. Momentum and position to be handled by the derived classes
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requested to merge ATLAS-EGamma/athena:ParametersBase_refactor_to_make_easy_for_pattern into master
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Refactor ParameterBase. Now the momentum, position are to be completely handled by the derived classes .
This allows for a cleaner usage e.g from Pattern parameters or other cases.
Actually, this makes also a bit more logical sense also, since we need the surface to do the tranforms for position /momentum in most cases .