Color: Warn more specifically on bad color specification. #25476
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Description
If you create a color incorrectly, the error is not very general.
Now the "Unknown color ..." message only applies if the color appears to not be a HEX or CSS-function style color.
e.g.
new THREE.Color("#ff")
previously warned "Unknown color #ee" and now gives "Invalid hex color #ee".e.g.
new THREE.Color("lab(1,1,1)")
previously warned "Unknown color lab(1,1,1)" and now warns "Unknown color model lab(1,1,1)"