HGTD_IdCnv → HGTD_DetDescr Relation

File in HighGranularityTimingDetector/HGTD_DetDescrCnv/HGTD_IdCnv	Includes file in HighGranularityTimingDetector/HGTD_DetDescr
src / HGTD_IDDetDescrCnv.h	HGTD_Identifier / HGTD_Identifier / HGTD_ID.h