First pass replace GetOutputFolder() with GetWorkingFolder().

GetWorkingFolder() has a few more convenience features.  It also implements a new folder convention based on a single recipe working folder instead of multiple configurable input/output folders.
Merge branch 'workingPaths' of https://github.com/DavidBrainard/RenderToolbox3 into workingPaths

Conflicts:
	ExampleScenes/Dragon/MakeDragonGraded.m
	ExampleScenes/Interior/MakeInterior.m
	ExampleScenes/Interior/MakeInteriorDragon.m
	ExampleScenes/RGBPromotion/MakeRGBPromotionFigure.m
	ExampleScenes/SpectralIllusion/MakeSpectralIllusion.m