Defining data structures of Forward Spectator Detector in CbmRoot.
In core/data/fsd/ the addressing scheme is defined together with Point, Digi and Hit classes.
In core/detectors/fsd/ a structure to encapsulate a detector geometry properties is defined and intialized from the corresponding .geo.root file.
At the same place, currently, an empty factory for parameter containers is present. At several other places, FSD was added in a similar fashion as PSD was used.

Increase the version numbers for the Boost and Root streamers in CbmDigiData The increase of the Root streamer version was forgotten when adding the Trd2d with commit #190d49ee. To be consistent again both version numbers are synchronised and put to 5.