Three additional HLT2 open charm lines for SMOG2

This MR adds three hlt2 lines for SMOG2 physics: Omega_c0, Xi_c0, Xi_c+.

The lines are tested with expected 2024 pAr, pAr+pp, pHe and pHe+pp simulation samples (10000 events), with the same HLT2 configuration as described in Moore!2915 (merged).

Hlt2IFT_SMOG2Omegac0TopKKPi: Omega_c0 -> p+ K- K- pi+ , pAr Rate: 0.11% , pAr+pp Rate: 0.05%, pHe rate: 0.009%, pHe+pp rate: 0.013% Hlt2IFT_SMOG2Xic0TopKKPi: Xi_c0 -> p+ K- K- pi+ , pAr Rate: 0.03% , pAr+pp Rate: 0.01%, pHe rate: 0.006%, pHe+pp rate: 0.008% Hlt2IFT_SMOG2XicpTopKPi: Xi_c+ -> p+ K- pi+ , pAr Rate: 0.39% , pAr+pp Rate: 0.33%, pHe rate: 0.072%, pHe+pp rate: 0.096%

Event rates are small compared with those presented in Moore!2915 (merged) for other SMOG2 HLT2 lines.