CSS.g: add support for modern rgb()/rgba() function syntax that has whitespace instead of commas between values, and forward slash / before alpha

Now supports both new and legacy syntax

rgb(100%, 100%, 100%) /* legacy rgb() */
rgb(100% 100% 100%) /* new rgb() */
rgba(100%, 100%, 100%, 100%) /* legacy rgba() */
rgba(100% 100% 100% / 100%) /* new rgba() */
3 files changed