TrackVectorFitter Event/* changes

Daniel Hugo Campora Perezrequested to merge
kalman_master into master

This merge request should go together with Rec!497 (merged) and Brunel!143 (merged).

Essentially, in order for TrackVectorFitter to work while preserving TrackMasterFitter compatibility, some structural refactoring was needed.

  • Refactor LHCb::Node to include some LHCb::FitNode definitions.
  • Added LHCb::ChiSquare to Event/ (previously defined in Rec::FitEvent/).
  • Added chi2 types (TT, downstream, etc.) to TrackFitResult (from FitEvent/KalmanFitResult).

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