Updated ColorValue>>fromString: to support 3-digit notation

> I had just updated fromString method to support three-digit notation and
>  pass the following test case, was thinking it might be useful to
>  someone, but again, can't quite say if this is something Cincom folks
>  need to integrate in their branch of Squeak-Extensions or something that
>  should go into Squeak's version, so don't jump on my case for
>  cross-posting please ;)
>
>  testColorFromString
>
>   self assert: (ColorValue fromString: 'ff0000') = ColorValue red.
>   self assert: (ColorValue fromString: 'FF0000') = ColorValue red.
>   self assert: (ColorValue fromString: '#ff0000') = ColorValue red.
>   self assert: (ColorValue fromString: '#FF0000') = ColorValue red.
>   self assert: (ColorValue fromString: 'f00') = ColorValue red.
>   self assert: (ColorValue fromString: 'F00') = ColorValue red.
>   self assert: (ColorValue fromString: '#f00') = ColorValue red.
>   self assert: (ColorValue fromString: '#F00') = ColorValue red.
>   self assert: (ColorValue fromString: 'red') = ColorValue red.
>   self assert: (ColorValue fromString: 'RED') = ColorValue red.
>   self assert: (ColorValue fromString: '#red') = ColorValue red.
>   self assert: (ColorValue fromString: '#RED') = ColorValue red.
>
>  Cheers,
>
>  -Boris
>
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