First go at removing Run2 specific code

Here is an attempt to describe what is being dropped. Someone more competent can follow up with issues or re-adding back adapted code where appropriate.

• Partially removed:
  • ATrackSelector (Alignment/AlignTrTools): remove TT/IT/OT filters
  • AlignSaveTuple and AlignTrackMonitor (Alignment/AlignTrTools): remove TT/IT/OT quantity calculation and saving/histograming
    • These two algorithms seems to share a lot of identical code (some of which is removed here). Some refactoring will be needed to get rid of that duplication.
    • fitTrackPiece is removed, which looks generic and probably usable for Run3
    • boxOverlap is almost generic (except for a bit of ST knowledge), so it can probably be reused
  • GetElementsToBeAligned (Alignment/TAlignment): remove Run 1-2 detectors
  • VAlign (Alignment/VeloAlignment): remove counting of number of R/Phi hits per track. Probably to be replaced with VP equivalent.
• Completely removed:
  • GAlign (Alignment/TAlignment): an unused alignment algorithm?
  • AlRobustAlignAlg (Alignment/TAlignment): used only for magnet off alignment of TT/IT/OT startings from VELO tracks? Creates residual histograms.
    • This seems reasonably generic code that can probably be reused
  • Calibration/OTCalibration package

See Rec!1714 (merged) for some motivation behind this