Prepare for track v2

Sascha Stahlrequested to merge
prepareForTrackV2 into master

Change a few things to make transition to a new track type easier.

  1. Use using Track = LHCb::Event::v1::Track in class header and anonymous namespaces in .cpp to specify the track type used.
  2. Change output and input types of PrLongLivedTracking, PrMatchNN and PrHybriSeeding from Tracks to vector<Track>.
  3. Remove use of key in constructor in upgrade pattern recognition algorithms. Following #24 (closed) the next track type should not inherit from KeyedObject.
  4. Some minor changes.
Edited by Marco Cattaneo

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