🌈️ apply a wallpaper based on the weather outside
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this fixes the weird and jank conversion to LAB and the therefore
incorrect delta E
also map lightness to sqrt of radiation because that is how the sky
works
- use zenith and nadir to calculate max and min angles instead of 90°
- map hue along quintic curve
- adjust hue to use correct sunrise altitude -0.833 instead of 0
because we're not doing floating point arithmetic anymore