Significant bug fixes
- Use the correct contrast colour on hashtag tab chips (#47)
- Scale the monochrome icon to fit (#46)
- Restore the user's home timeline position (#44)
- Ensure refreshing does not create a gap in the timeline (#43)
- Show the FAB according to the user's preferences (#29)
- Fix toolbar flickering when scrolling lists (#26)
- Fix crash on entering MainActivity on Pixel C devices (#25)