isf: improve include mechanism #2645

Job	Run time
Template generation (score-avnd-simple-template)	26s
Template generation (score-vfx-template)	21s
Template generation (score-process-template)	26s
Template generation (score-device-template)	27s
Template generation (score-offline-process-template)	23s
score-vfx-template (Windows)	8m 42s
score-process-template (Windows)	9m 15s
score-device-template (Windows)	10m 12s
score-avnd-simple-template (Windows)	10m 5s
score-offline-process-template (Windows)	9m 20s
score-vfx-template (Ubuntu)	6m 9s
score-process-template (Ubuntu)	4m 59s
score-device-template (Ubuntu)	4m 52s
score-avnd-simple-template (Ubuntu)	5m 6s
score-offline-process-template (Ubuntu)	4m 50s
score-vfx-template (macOS)	4m 12s
score-process-template (macOS)	5m 11s
score-device-template (macOS)	4m 55s
score-avnd-simple-template (macOS)	5m 1s
score-offline-process-template (macOS)	5m 12s
	1h 40m 4s

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