- Add number row / underlying symbol support in character layouts
  - First row of each character layout has numbers 1-9 and 0 integrated
  - Second and third row have symbols according to the symbol layout
  - Number row / Underlying symbols can be enabled/disabled seperately
    in the preferences
- Add bottom offset option to accommodate for curved screens (#20)
- Add option to turn off auto-capitalization (#21)
- Fix clipboard/cursor UI not updating in Smartbar when text selection
  has changed
- Improve emoji layout
  - Scroll orientation is now vertical to better scale to different sizes
    of the keyboard
- Temporarily remove swipe velocity threshold as it causes gestures to be
  ignored in certain circumstances