The utility functions are organized according to whether
their declarations and/or their definitions are platform-independent.

Geometry Games Utilities

	GeometryGamesLocalization.c
	GeometryGamesLocalization.h

	GeometryGamesUtilities-Common.h
		declares
			functions with platform-independent implementations
				defined in GeometryGamesUtilities-Common.c
			functions with platform-dependent implementations
				defined in GeometryGamesUtilities-iOS|Mac|Win.c
	GeometryGamesUtilities-Common.c
		implements platform-independent functions
			declared in GeometryGamesUtilities-Common.h

	GeometryGamesUtilities-iOS.h
		declares functions with iOS-specific declarations
	GeometryGamesUtilities-iOS.m
		implements platform-dependent functions
			declared in GeometryGamesUtilities-Common.h
		as well as all functions declared in GeometryGamesUtilities-iOS.h

	GeometryGamesUtilities-Mac.h
		declares functions with Mac-specific declarations
	GeometryGamesUtilities-Mac.m
		implements platform-dependent functions
			declared in GeometryGamesUtilities-Common.h
		as well as all functions declared in  GeometryGamesUtilities-Mac.h
