Support hsl/hsla expressions in ColorConverterFactory CSS mode

Description

Support color expressions such as hsl(12, 100%, 50%) and hsla(12, 100%, 50%, 0.5) (as per Mapbox styles spec and common CSS usage).
See also:

Environment

None

Assignee

Andrea Aime

Reporter

Andrea Aime

Triage

None

Components

Fix versions

Priority

Medium
Configure