Support modern CSS color notations

[omgovich]

Library's parsers were improved to support more CSS color formats and units.

// Percentage syntax
"rgb(100% 50% 25%)"

// Valid angular units ("deg", "grad", "rad" and "turn")
"hsl(100grad, 50%, 50%)"
"hsl(0.25turn, 50%, 50%)"

// Modern space and slash separated syntax 
"rgba(100% 50% 25% / 99%)"
"hsla(90 50% 50% / 10%)"

// Optional leading zero
"rgb(.99% .1% .5% / .6%)"
"hsla(.2rad, .99%, .5%, .25)"

[codecov-commenter]

Codecov Report

Merging #133 (683da01) into master (c9b3a32) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            master      #133   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           33        33           
  Lines          422       428    +6     
  Branches        53        57    +4     
=========================================
+ Hits           422       428    +6     

Impacted Files	Coverage Δ
src/utils/convert.ts	100.00% <100.00%> (ø)

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update c9b3a32...683da01. Read the comment docs.

[github-actions]

Size Change: +126 B (+3%)

Total Size: 4.21 kB

Filename	Size	Change
dist/index.module.js	4.21 kB	+126 B (+3%)

_{compressed-size-action}