Use CIE L* (psychometric lightness) mapped from luminance
(assumes uniform luminance for R, G, and B channels)

Predefined colors are assumed to be LED values

Also simplified sparkle pattern memory

- New definitions can be delivered via MQTT
 - Includes extensible pattern class for new preset types

Also simplified sparkle pattern memory

- New definitions can be delivered via MQTT
 - Includes extensible pattern class for new preset types

Includes terminal LED simulator