[FEATURE] Add support for from keyword in parseColorFunction

[samuil-banti-wpenigne]

When we pass values like hsl( triggers Color::parseColorFunction() to parsePrimitiveValue method, the parsing
fails.

The from keyword is not recognized. Instead, Size::parse() is called, which sees fr at the start of from and matches it as the fr, creating Size(0.0, 'fr').

CSS example:

div {
    background-color: hsl(from var(--gcid-lvhfuivypo) calc(h + 0) calc(s + 0) calc(l + 0) / 0.66);
}

[coveralls]

coverage: 74.621% (+0.06%) from 74.566% — samuil-banti-wpenigne:add-support-for-from-keyword-in-parseColorFunction into MyIntervals:main

[JakeQZ]

This looks excellent to me, and a perfect way of handling from for the time being, until we work out a way of getting it into the Color class.

I like the tests, particularly the nested one.

The only nitpick I have is the naming of a data provider. @oliverklee, do you have anything else to comment on?

@samuil-banti-wpenigne, thanks again for understanding the codebase and finding the best fix, and including a good suite of accompanying tests.

[oliverklee]

Beautiful! Thank you for contributing this, @samuil-banti-wpenigne!