Add a separate file for the drifttime map of the 1D TRD modules.

Up to now the histo representing a drifttime map for the 1D TRD modules is stored in FeatureExtractionLookup.root. Yet to come updates/upgrades of the 1D digitizer part will use the new separated file. As soon as they superseded the current implementation the drifttime map histo will be removed from the FeatureExtractionLookup file.