Make TimeWinEventBuilder Algo more generic and compatible with simulated data

As first step toward a general event builder for CBM, it would be good to test the mCBM2020 Time Window base event builder on simulated data.

This MR tries to bring in this compatibility by adding interfaces to disable/override some mCBM specific feature:

• Allow to run without TsMetaData array by providing the TS properties as fixed values from the macro
• Allow to switch from the CbmMuchBeamtimeDigi to the CbmMuchDigi classes

Warning: These options compile but are untested as of now! Edit 27/01/2021: now tested and included in CI

@d.smith: could you please check if we these one can apply the event builder algo over simulated data?

macro/run/run_reco.C

@@ -199,10 +199,57 @@ void run_reco(TString input        = "",
       eventBased = kTRUE;
     }  //? Ideal raw event building
     else if (evBuildRaw.EqualTo("Real", TString::ECaseCompare::kIgnoreCase)) {
-      std::cerr << "-E- " << myName
-                << ": Real event building is not yet available! "
-                << "Terminating macro execution." << std::endl;
-      return;
+      // ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ //
+      /// to use 2018 version, uncomment this section and comment the next one
+      /*
+      CbmMcbm2018EventBuilder* evBuildRaw = new CbmMcbm2018EventBuilder();
+
+      evBuildRaw->SetFixedTimeWindow(5500.);
+      evBuildRaw->SetTriggerMinNumberSts(50);
+
+      if (!useSts) {
+        std::cerr << "-E- " << myName << ": Sts must be present for raw event "
+                  << "building using ``Real'' option. Terminating macro."
+                  << std::endl;
+         return;
+      }
+      */
+      // ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ //
+
+      // ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ //
+      /// to use 2018 version, uncomment this section and comment the prev. one
+      CbmMcbm2019TimeWinEventBuilderTask* evBuildRaw =
+        new CbmMcbm2019TimeWinEventBuilderTask();
+      evBuildRaw->SetTsParameters(0.0, 1.e7, 0.0);
+
+      // Use CbmMuchDigi instead of CbmMuchBeamtimeDigi
+      evBuildRaw->ChangeMuchBeamtimeDigiFlag(kFALSE);
+
+      // Remove detectors where digis not found
+      if (!useRich) evBuildRaw->RemoveDetector(kEventBuilderDetRich);
+      if (!useMuch) evBuildRaw->RemoveDetector(kEventBuilderDetMuch);
+      if (!usePsd) evBuildRaw->RemoveDetector(kEventBuilderDetPsd);
+      if (!useTof) evBuildRaw->RemoveDetector(kEventBuilderDetTof);
+      if (!useTrd) evBuildRaw->RemoveDetector(kEventBuilderDetTrd);
+
+      // Remove STS as it will be our reference
+      evBuildRaw->RemoveDetector(kEventBuilderDetSts);
+
+      // Set STS as reference detector
+      evBuildRaw->SetReferenceDetector(kEventBuilderDetSts);
+
+      //Choose between NoOverlap, MergeOverlap, AllowOverlap
+      evBuildRaw->SetEventOverlapMode(EOverlapMode::AllowOverlap);
+
+      evBuildRaw->SetTriggerMinNumber(ECbmModuleId::kSts, 10);
+      evBuildRaw->SetTriggerMaxNumber(ECbmModuleId::kSts, -1);
+      evBuildRaw->SetTriggerWindow(ECbmModuleId::kSts, -5500, 5500);
+      // ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ //
+
+      run->AddTask(evBuildRaw);
+      std::cout << "-I- " << myName << ": Added task " << evBuildRaw->GetName()
+                << std::endl;
+      eventBased = kTRUE;
     }  //? Real raw event building
     else {
       std::cerr << "-E- " << myName << ": Unknown option " << evBuildRaw