Lawnchair 2 2.0-1905-ci-alpha

Changelog for build alpha-1905:
- Fragment#getActivity can be null (by Till Kottmann)
- Fix remaining crashes on Lollipop (by Till Kottmann)
- Setup proper optimization rules for GSON and OWM in specific (by Till Kottmann)
- Fix OWM integration, initial support for location based weather with OWM (by Till Kottmann)
- Don't treat launching actions as app launches (by Till Kottmann)
- Only use up to 100 events to predict actions (by Till Kottmann)
- Migrate icon shape override to general preferences to allow backing it up (by Till Kottmann)
- Get rid of non-working Telegram chat plugin (by David Sn)
- Reduce unnecessary usage of lazy initialization (by paphonb)
- Create rootless Actions Suggestions implementation (by Till Kottmann)
- Fix opening home settings (by Till Kottmann)
- Add fallback app suggestion algorithm for users without root (by Till Kottmann)
- Fix crash when choosing icon pack after scrolling down (by Till Kottmann)
- Fix remaining improper iconback existence check (by Till Kottmann)
- Lazily init more stuff to try to reduce memory footprint (by Till Kottmann)
- Refactor drawer tabs backend (by paphonb)
- Significantly improve icon pack parsing speed (by Till Kottmann)
- Reduce log spill when Lawnchair isn't set as default (by Till Kottmann)
- Properly fallback to DefaultPack in #newIcon (by Till Kottmann)
- Remove 2019 April Fools’ Day joke (by paphonb)
- Clean up preference controller delegates (by paphonb)
- Fix crash when spamming delete button in tabs editor (by paphonb)
- Use hardware bitmap for folder icon preview (by paphonb)
- Improvements to tab name editor (by paphonb)
- Improve tab indicator (by paphonb)
- Initial support for custom folder icons (by Till Kottmann)
- Update dependencies for latest AS canary (by Till Kottmann)