HGTD_GeoModel → HGTD_Identifier Relation

File in HighGranularityTimingDetector/HGTD_DetDescr/HGTD_GeoModel	Includes file in HighGranularityTimingDetector/HGTD_DetDescr/HGTD_Identifier
src / HGTD_DetectorFactory.cxx	HGTD_Identifier / HGTD_ID.h