Range of LCH values

The LCH values in this library are implemented with the following range:

	l	a	b	c	h
CIELab/CIELCh	[0, 100]	[0, 255]	[0, 255]	[0, 255]	[0, 360[
Oklab/Oklch	[0, 1]	[0, 2]	[0, 2]	[0, 2]	[0, 360[

This range is enough to cover the hole range of human perception. (Note that the actual range of human perception has an irregular shape and covers only parts of all possible combinations of LCH values. And the actual gamut of real-word output devices is smaller than the human perception.)