flashlight: Add multiple display modes #2379
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Adds various modes to the flashlight app:
Tapping the screen cycles through these modes. This makes it behave more like standard headlamps or safety hiking/cycling lights, with the first mode always red to not affect your pupils in the dark.
Note: The strobe looks strange in the animation because of the InfiniSim refresh rate. It looks better on the real watch (although you can still see the screen draw if you're staring straight at it, which you probably shouldn't anyway 😺)
Also the strobe is 2Hz at 30% duty cycle (150ms on, 350ms off), which provides good visibility from a distance and is low enough that it won't trigger people with photosensitive epilepsy.