[WiP] Shower Start Finder develop
- Implemented first version of MCTruth SSF with hardness cut for events
- MCTruth SSF cleanup and first modification to check step history
- Hardness criterium implemented in Ahc2MCTruthHardShowerStart
- Cleanup of code and added conditions for punch through events
- MC True Hard Shower Start Finder Bug Fixing and Cleaning
- Corrected MCHardTruth SSF for June Geometry
- Shower Start Finder Optimized, lin function threshold, mip criterium, z coordinate