Adding configuration for light nuclei

Author: lucamicheletti

MC/config/PWGDQ/ini/Generator_InjectedPromptCharmoniaFwdy_TriggerGap_OO5TeV.ini

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+### The external generator derives from GeneratorPythia8.
+[GeneratorExternal]
+fileName=${O2DPG_MC_CONFIG_ROOT}/MC/config/PWGDQ/external/generator/generator_pythia8_withInjectedPromptSignals_gaptriggered_dq.C
+funcName=GeneratorPythia8InjectedPromptCharmoniaGapTriggered(5,11)
+
+[GeneratorPythia8]
+config=${O2DPG_MC_CONFIG_ROOT}/MC/config/PWGDQ/pythia8/generator/pythia8_inel_triggerGap_OO5TeV.cfg

MC/config/PWGDQ/pythia8/generator/pythia8_inel_triggerGap_OO5TeV.cfg

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+### beams
+Beams:idA 1000080160			# oxygen
+Beams:idB 1000080160 			# oxygen
+Beams:eCM 5360. 		        # GeV
+Beams:frameType = 1
+
+### processes
+SoftQCD:inelastic on		# all inelastic processes
+CharmoniumShower:all = on
+
+### decays
+ParticleDecays:limitTau0 on	
+ParticleDecays:tau0Max 10.
+
+#### Heavy ion settings
+HeavyIon:SigFitErr = 0.02,0.02,0.1,0.05,0.05,0.0,0.1,0.0
+HeavyIon:SigFitDefPar = 17.24,2.15,0.33,0.0,0.0,0.0,0.0,0.0