Draft: Improvement of Lc and Xic MVA lines

Description

This MR is meant to:

1. Add second MVA builder for xic0
2. Improve variables for Lc0 MVA
3. Remove MVA lines from cbaryon_spectroscopy.py
4. Add MVA lines to new module cbaryon_spectroscopy_mva.py
5. Add dedicated 4-track BDT.

Rates

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INFO:    Starting /afs/cern.ch/work/a/acampove/stack/DaVinci/HltEfficiencyChecker/scripts/hlt_calculate_rates.py...
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INFO:    No lines specified. Defaulting to all...
HLT rates: 
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Line:    Hlt2Charm_LcpToPpKmPip_MVA_PRDecision           Incl: 0.77777 +/- 0.0718 kHz,  Excl: 0.67805 +/- 0.0671 kHz
Line:    Hlt2Charm_Xic0ToPpKmKmPip_MVA_PRDecision        Incl: 0.36561 +/- 0.0492 kHz,  Excl: 0.30579 +/- 0.0450 kHz
Line:    Hlt2Charm_XicpToPpKmPip_MVA_PRDecision          Incl: 0.31243 +/- 0.0455 kHz,  Excl: 0.24596 +/- 0.0404 kHz
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Hlt2 Total:                                          Rate:       1 +/- 0.1 kHz
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To be tested with lhcb-datapkg/ParamFiles!91