Follow changes in LHCb!3917
- Converters: use new functionality of LinksByKey to simplify code, remove mention of LinkerWithKey
- CopySignalMCParticles: modernize and adapt to changes in LHCb!3917 (merged)
- TrackCloner{,WithCluster}: adapt to changes in LHCb!3917 (merged) (drop use of LinkerWithKey)
- Pr associators: adapt to LinksByKey constructor changes in LHCb!3917 (merged)
- Pr checkers: do not keep associators as member data that outlive the scope of an event
- TrackAssociator: do not keep event-specific state as member data
Edited by Gerhard Raven