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Change IBeamIntensity API to take run and event number explicitly

Beojan Stanislaus requested to merge bstanisl/athena:change-ibeamintensity-api into main
  • The IBeamIntensity API now takes the run and event number explicitly.
  • StepArrayBM and ArrayBM now use ContextSpecificData for the t0 offset. SlotSpecificObj is not used because this also needs to work when there is no valid context
  • ArrayBM now has a Seed property. If this is set to a non-zero value, it uses FastReseededPRNG seeded with this value and the run and event number instead of the AthRNGSvc
  • FastReseededPRNG has been added to CxxUtils. For now xxhash is vendored, until it can be added to externals or the LCG release
Edited by Beojan Stanislaus

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