Unify richlistitem styling rules
- Fix richlistitem unwanted focus ring on Linux
fix: #4510
- Simplify richlistbox styling rules and do not follow Mozilla code
- Use --default-focusring-width for v-table
- Word for Windows not tested since there's no build yet
- Word for Mac currently causes a sigsev, and likely we'll see this on
windows too. This is happening on an API call where we pass a callback,
so likely an issue in ctypes that we'll have to work around.
- All integration UIs restored.
- Added a component for richlistitems with a checkbox with corresponding
interactions (spacebar/double-click to toggle).
