Attention: v0.17.0 breaks existing widget installations (#932).
When updating from older versions your home screen widgets may be removed and will need to be re-added.

- adds "Material You" app themes.
- adds "fancy digital clock" widgets.
- adds custom events ("shadow factor", "day percent", "moon elevation", and "moon illumination").
- adds world map projections (Mercator, Mercator equal-area, and Van der Grinten).
- improves widget configuration (adds "widget preview").
- improves navigation in sun, moon, and world map dialogs (seek date/time).
- improves searching places (adds descriptive tags and "sort places" action).
- enhances the "add places" dialog ("gnss status" and other gps related improvements).
- updates targetSdk to Android 11 (api30), and migrates app to AndroidX.