TrigOutputHandling → DecisionHandling Relation

File in Trigger/TrigSteer/TrigOutputHandling	Includes file in Trigger/TrigSteer/DecisionHandling
src / HLTEDMCreator.h	DecisionHandling / IHLTOutputTool.h
src / HLTEDMCreatorAlg.h	DecisionHandling / IHLTOutputTool.h