Release 1.10.0

- Xwayland support
- Keys' press zone extends to the side edges of the widget
- Layout popover separates languages from special layouts
- Popover can open settings
- Layout tester checks for presence of Backspace and Return
- Friulian keyboard layout
- Ukrainian layout
- Belgian layout
- Wide French layout
- Wide Belgian layout
- Wide terminal layout
- Improved tutorial
- Improved README
- Stricter compilation checks
- Minor fixes

WIP: need to work around a11y error