Support new CSS color() strings

[KaliedaRik]

The CSS Color Module Level 4 spec introduced new CSS color strings for predefined color spaces such as:

• color(srgb 0 0 0 / 1)
• color(srgb-linear 0 0 0 / 1)
• color(display-p3 0 0 0 / 1)
• color(a98-rgb 0 0 0 / 1)
• color(prophoto-rgb 0 0 0 / 1)
• color(rec2020 0 0 0 / 1)
• color(xyz 0 0 0 / 1)
• color(xyz-d50 0 0 0 / 1)
• color(xyz-d65 0 0 0 / 1)

This PR checks that the SC color system can interpret these strings as color inputs, making changes as required. It also adds a new demo - canvas-057 - to test output from these inputs.