Remove all mentions of HepMC and obsolete detectors

This implements #9 (closed)

HepMC is no longer written to simulated data, see LHCb!2871 (merged) . LoKiGen, which depends on it is moved from LHCb to Gauss.

Consequently, LoKiGenMC which does hepMC<->MC association is removed. LoKiPhysMC and LoKilgoMC are cleaned up accordingly.

• Inherits.h is moved from LoKiGenMC to LoKiPhysMC

Phys/FlavourTaggingChecker which depends on it heavily is also removed. cc @dohanlon @vchobano @bkhanji @mfuehrin @mschille

LoKiExample is also removed.

Plus two changes from !709 (closed) :

• Phys/DecayTreeTupleTracking/src/TupleToolMCAssociatedClusters.cpp : replace old with new detectors
• Phys/DecayTreeTupleTracking/src/TupleToolTrackTime.cpp : remove unnecessary dependency on OTDet