implement day/night ratio

[github-actions]

Clonecraft/scripts/worldControl.gd

Lines 15 to 20 in b357428

	#TODO implement day/night ratio
	@export var dayNightRatio:float:
	set(value):
	dayNightRatio = clampf(value, 0, 1)
	@export var upperSkyColor:Gradient
	@export var upperHorizonColor:Gradient

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This issue was generated by todo-issue based on a TODO comment in b357428. It's been assigned to @clarence112 because they committed the code.