add regex-based HltDecReports ThOr filter, add cached lookup

Gerhard Ravenrequested to merge
hlt_filter_functor_LoKi_to_ThOr-followup into master
  • Add a functor that checks whether any DecReport matching a regex has a positive decision
  • Add cached (thread-safe!) lookups in HltDecReports based on the assumption that for a given TCK the indices for the line names are invariant.

Extension of / Follow up to !2598 (merged)

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