ThOr migration of prompt D0->hh lines

Updating D0->hh lines to use ThOr functors. These include:

The four standard lines Hlt2CharmDstpToD0Pip_D0TohhLine directly correspond to the standard Run2 lines.

The four low bias lines Hlt2CharmDstpToD0Pip_D0Tohh_LowBiasLine use more simple and robust selections and roughly correspond to the "LTUNB" lines of Run 2 with the addition of IP requirements on tracks to reject the majority of the background. They are expected to be largely overlapped with the high-purity Hlt2CharmDstpToD0Pip_D0TohhLine lines and with small increase of final HLT2 rate. These lines should fire only on the Hlt1 TOS decision of the lines in Allen!741 (merged) .

Three untagged standard lines Hlt2CharmD0TohhLine and three untagged low bias lines Hlt2CharmD0Tohh_LowBiasLine are also added. These are very helpful as calibration lines (detection asymmetries) and can be exploited for physics measurements DeltaY, yCP, ACP(D0->KK), D0 production asymmetries, etc. The untagged low bias lines can also be used as validation lines for the Hlt1 lines of Allen!741 (merged).

The following rates are calculated using the upgrade_minbias_hlt1_filtered sample. Note that the rates for the Low Bias lines are not calculated using the relative Hlt1 information and they could vary. Due to their high rates the untagged lines will probably need some prescale.

HLT rates: 
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Line:    Hlt2CharmD0ToKmKpLineDecision                           Incl:  1.7353000066742308 +/- 0.34 kHz, Excl:  0.8676500033371154 +/- 0.24 kHz
Line:    Hlt2CharmD0ToKmKp_LowBiasLineDecision                   Incl:  0.9343923112861243 +/- 0.24 kHz, Excl:  0.26696923179603554 +/- 0.13 kHz
Line:    Hlt2CharmD0ToKmPipLineDecision                          Incl: 11.079223119535472 +/- 0.85 kHz, Excl:  2.736434625909364 +/- 0.42 kHz
Line:    Hlt2CharmD0ToKmPip_LowBiasLineDecision                  Incl: 10.67876927184142 +/- 0.83 kHz, Excl:  2.1357538543682844 +/- 0.37 kHz
Line:    Hlt2CharmD0ToPimPipLineDecision                         Incl:  4.605219248481613 +/- 0.55 kHz, Excl:  2.4027230861643196 +/- 0.39 kHz
Line:    Hlt2CharmD0ToPimPip_LowBiasLineDecision                 Incl:  7.675365414136021 +/- 0.71 kHz, Excl:  5.005673096175666 +/- 0.57 kHz
Line:    Hlt2CharmDstpToD0Pip_D0ToKmKpLineDecision               Incl:  0.33371153974504436 +/- 0.14 kHz, Excl:  0.0 +/- 0.0  kHz
Line:    Hlt2CharmDstpToD0Pip_D0ToKmKp_LowBiasLineDecision       Incl:  0.06674230794900889 +/- 0.06 kHz, Excl:  0.0 +/- 0.0  kHz
Line:    Hlt2CharmDstpToD0Pip_D0ToKmPipLineDecision              Incl:  2.0022692384702663 +/- 0.36 kHz, Excl:  0.0 +/- 0.0  kHz
Line:    Hlt2CharmDstpToD0Pip_D0ToKmPip_LowBiasLineDecision      Incl:  1.668557698725222 +/- 0.33 kHz, Excl:  0.0 +/- 0.0  kHz
Line:    Hlt2CharmDstpToD0Pip_D0ToPimKpLineDecision              Incl:  0.8676500033371154 +/- 0.24 kHz, Excl:  0.0 +/- 0.0  kHz
Line:    Hlt2CharmDstpToD0Pip_D0ToPimKp_LowBiasLineDecision      Incl:  1.0011346192351331 +/- 0.25 kHz, Excl:  0.0 +/- 0.0  kHz
Line:    Hlt2CharmDstpToD0Pip_D0ToPimPipLineDecision             Incl:  1.2681038510311686 +/- 0.29 kHz, Excl:  0.0 +/- 0.0  kHz
Line:    Hlt2CharmDstpToD0Pip_D0ToPimPip_LowBiasLineDecision     Incl:  1.4683307748781953 +/- 0.31 kHz, Excl:  0.0 +/- 0.0  kHz
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Hlt2 Total:                                                     Rate:    27 +/- 1.3 kHz
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FYI: @mimorell