Add Trd2d for event building

The MR is aimed at fixing a problem appeared for the Trd2d with the advent of mCBM 2021 data taking but affecting the whole TRD group on the longer run; namely the accommodation of 2 pad-plane pick-up electrode topologies (rectangular and triangular) operated by 2 types of FEEs (SPADIC and FASP). Since this is a particularity of only the TRD system the modifications are somehow wider affecting tangentially also parts of the general steering code.

Basically the MR aims at the following :

• Extend functionality of BuildRawEvents (Algo/Task) to incorporate also data from Trd2d
• Add data descriptors for Trd2d in the CbmDefs
• add a proposal for a steering script for event building for mcbm 2021

reco/eventbuilder/digis/CbmAlgoBuildRawEvents.h

@@ -94,6 +94,8 @@ static const RawEventBuilderDetector kRawEventBuilderDetMuch =
   RawEventBuilderDetector(ECbmModuleId::kMuch, ECbmDataType::kMuchDigi, "Much");
 static const RawEventBuilderDetector kRawEventBuilderDetTrd =
   RawEventBuilderDetector(ECbmModuleId::kTrd, ECbmDataType::kTrdDigi, "Trd");
+static const RawEventBuilderDetector kRawEventBuilderDetTrd2d =
+  RawEventBuilderDetector(ECbmModuleId::kTrd2d, ECbmDataType::kTrd2dDigi, "Trd2d");
 static const RawEventBuilderDetector kRawEventBuilderDetTof =
   RawEventBuilderDetector(ECbmModuleId::kTof, ECbmDataType::kTofDigi, "Tof");
 static const RawEventBuilderDetector kRawEventBuilderDetRich =
@@ -185,6 +187,7 @@ public:
   void SetStsDigis(std::vector<CbmStsDigi>* StsDigis) { fStsDigis = StsDigis; }
   void SetMuchDigis(std::vector<CbmMuchDigi>* MuchDigis) { fMuchDigis = MuchDigis; }
   void SetTrdDigis(std::vector<CbmTrdDigi>* TrdDigis) { fTrdDigis = TrdDigis; }
+  void SetTrd2dDigis(std::vector<CbmTrdDigi>* TrdDigis) { fTrd2dDigis = TrdDigis; }
   void SetTofDigis(std::vector<CbmTofDigi>* TofDigis) { fTofDigis = TofDigis; }
   void SetRichDigis(std::vector<CbmRichDigi>* RichDigis) { fRichDigis = RichDigis; }
   void SetPsdDigis(std::vector<CbmPsdDigi>* PsdDigis) { fPsdDigis = PsdDigis; }
@@ -280,6 +283,7 @@ private:
   const std::vector<CbmMuchBeamTimeDigi>* fMuchBeamTimeDigis = nullptr;
   const std::vector<CbmStsDigi>* fStsDigis                   = nullptr;
   const std::vector<CbmTrdDigi>* fTrdDigis                   = nullptr;
+  const std::vector<CbmTrdDigi>* fTrd2dDigis                 = nullptr;
   const std::vector<CbmTofDigi>* fTofDigis                   = nullptr;
   const std::vector<CbmRichDigi>* fRichDigis                 = nullptr;
   const std::vector<CbmPsdDigi>* fPsdDigis                   = nullptr;