Created helper class to access matching decorations

• Created helper class (TrackMatchAccessHelper) for easy access to matching information from decorations. The class replaces entirely the old TrackMatchingLookup class.
• Minor bugfixes and format fixing
• New efficiency plots class based on matching info
• Re-grouped histogram definitions based on type (trk parameters, efficiencies) rather than track type (offline, trigger, truth). Each category can be produced by setting bool flag in each TrkAna configuration
• Introduced common definition of standard variables (e.g. MAXETA) to be used in json histogram definition (now dynamically-defined)
• Split implementation of plots w.r.t. test and reference tracks quantities in separate instances

FYI @tstreble