Allow CSS vars with colors #161
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This PR allows for color values to be defined with CSS variables. This is inspired by #154 as a way to implement that request.
To keep things sane this PR requires any CSS variable value to also define a valid HEX color default. This way if the CSS
var()look up fails it will always fallback to a valid HEX color the theme defines.Additionally it changes slightly how the color values are stored to prevent breaking the expected CSS values. Again, old behaviour is preserved and all HEX values (even those within CSS vars) will be capitalized.