Add support for space-separated RGB

[JJC1138]

This is almost exactly the same as @htunnicliff's excellent PR #55, but just for the RGB case instead of HSL. It adds support for values like:

rgb(255 255 255)
rgb(255 255 255 / 1)

The motivation for this was that Chrome's developer tools now uses that form of notation for RGB colors, and I got bitten by blindly copying and pasting one into my CSS 😅

[clytras]

Thank you @JJC1138 for the awesome work!

Does the RE support alpha percentage like rgb(0 255 38 / 7%)?

@Qix- please merge and release, we need this!

[JJC1138]

Does the RE support alpha percentage like rgb(0 255 38 / 7%)?

No, I'm afraid not. I thought that was disallowed by the spec, but I see was wrong 😣 Sorry about that. I'm not using the library in my project anymore so I don't have an immediate need to work on that myself. You're very welcome to fork my branch to add support, of course.

[clytras]

@JJC1138 I just fix it to work with alpha percentage and added more tests. Everything passes and it works.

Please check this PR JJC1138#1 and merge.

[JJC1138]

Done. Thanks very much!

[Qix-]

Thanks :)

[Qix-]

Published as 1.7.0.

[clytras]

You're very welcome @Qix- , thank you for making this!

Now that I'm looking at it again, I think I should have used parseFloat for the percentage instead of parseInt. The spec says that it's a number, not an integer, thus it may have floating point numbers. What do you think?

[Qix-]

PR welcome. :)