hdx → glf Relation

File in pxr/imaging/hdx	Includes file in pxr/imaging/glf
simpleLightTask.h	simpleLight.h
simpleLightTask.h	simpleMaterial.h
skydomeTask.h	simpleLightingContext.h
taskController.h	simpleLightingContext.h
taskControllerSceneIndex.h	simpleLightingContext.h