gfx: add a way for render nodes to have a parent renderer, to allow s… #2662

Job	Run time
Template generation (score-avnd-simple-template)	20s
Template generation (score-vfx-template)	20s
Template generation (score-process-template)	20s
Template generation (score-device-template)	16s
Template generation (score-offline-process-template)	55s
score-vfx-template (Windows)	8m 23s
score-process-template (Windows)	8m 19s
score-device-template (Windows)	9m 37s
score-avnd-simple-template (Windows)	9m 40s
score-offline-process-template (Windows)	9m 47s
score-vfx-template (Ubuntu)	5m 46s
score-process-template (Ubuntu)	5m 39s
score-device-template (Ubuntu)	5m 6s
score-avnd-simple-template (Ubuntu)	5m 18s
score-offline-process-template (Ubuntu)	4m 46s
score-vfx-template (macOS)	5m 25s
score-process-template (macOS)	5m 36s
score-device-template (macOS)	5m 18s
score-avnd-simple-template (macOS)	5m 16s
score-offline-process-template (macOS)	5m 13s
	1h 41m 20s

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