Add support for all suncalc events

[jonferreira]

Hi all.

Instead of being limited to sunrise/sunset events it would be great of one could use all suncalc events.

Personally I've always used night to turn on and goldenHourEnd to turn off.

[maia]

This is a great idea. It feels natural to use the wide spectrum of events between the first onset of twilight and deep night. These gradual transitions run through several distinct phases defined by the sun’s elevation, and they last much longer in summer and much shorter in winter because the sun meets the horizon at different angles over the year.

Instead of relying solely on sunrise and sunset (or compensating with complex brightness curves such as tanh ramps) it could be simpler and more intuitive to define clear boundaries: start the transition at event X and finish it at event Y. That would make the behavior easier to reason about while aligning more closely with how brightness actually evolves across the seasons.