Space-separated color params and aliases aren't parsed correctly

[claviska]

This is an excellent library!

Thanks to a generous PR by @ajmchambers, TinyColor is now being used to power the color picker in Shoelace. 🎉

While reviewing the PR, I noticed a few small parsing blips that could be improved. On the website, the following space-separated color params fail to parse. All of the following are equivalent and should result in white @ 25% alpha, or #ffffff40.

rgb(255 255 255 / 25%) => #ffffffff
rgb(255 255 255 / .25) => #ffffffff

hsl(0 0% 100% / 25%)   => #ffffffff
hsl(0 0% 100% / .25)   => #ffffffff

The resulting values are all white, but with 100% instead of 25% alpha.

Similarly, rgba and hsla are effectively aliases of rgb and hsl now, but alpha is only considered when the alias is used.

rgb(255, 255, 255, 25%)  => #ffffffff
rgb 255 255 255 .25      => #ffffffff

rgba(255, 255, 255, 25%) => #ffffff40
rgba 255 255 255 .25     => #ffffff40

Let me know if you need any additional info on this!

[scttcper]

This feels like it might be a breaking change if we start parsing these differently, but the reason makes sense