Changelog for build alpha-314:
- [WIP] show backup previews (by paphonb)
- Save screenshot when creating a backup (by paphonb)
- Enable legacy icon treatment for all non-adaptive icons (by Till Kottmann)
- Don't mask legacy icons if an icon pack is applied (by Till Kottmann)
- Add developer option to always clear the icon cache (by Till Kottmann)