Gen/GenCuts: Minor update for LoKi::GenCutTool & new LoKi::GenCutToolWithDecay, see LHCBGAUSS-1437

Gen/GenCuts, see LHCBGAUSS-1437

• Minor update for LoKi::GenCutTool:

  • better output, that is easier to debug, and in particular to know the relative importance of various cuts
  • error/warning messages/counters for "unused" cuts (usually due to misconfiguration)
  • error/warning messages/counters for "missing" cuts (usually due to decay descriptors)
  • split the code to allow easier inheritance

• New derived tool LoKi::GenCutToolWithDecay. This tool allow to apply generic cuts (the same machinery) for "special" cases:

  • particles, produced with GenXiCC (tested for event type 26266051)
  • particles, produced with BcVegPy (tested for event type 14175001)
  • bottomonia (tested for event type 18244001) Essentially this new single tool can replaced all zoo of all specific Bc*, Xicc* and Upsilon* tools altogather