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?