WIP: Gen/GenCuts: Minor update for LoKi::GenCutTool & new LoKi::GenCutToolWithDecay, see LHCBGAUSS-1437
Port merge of branch 'LHCBGAUSS-1437.vanya-improve-generic-cut-tool' into 'master' See merge request !318 (merged) into 'Sim09' and !321 (merged) into 'Sim09-upgrade'
(cherry picked from commit da2d0c1c)