Tidying of ISF Sim Service code

After most of the functionality was migrated into the ISimulatorTool implementations the remaining ISimulationSvc implementations were mostly the same. This merge request replaces FastCaloSimSvc, FatrasSimSvc and ParticleKillerSimSvc with a common LegacySimSvc. Geant4SimSvc behaves slightly differently in one method, so cannot be merged trivially.

Edited by John Derek Chapman

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