8.2
[Tui] Fix column width accounting
[Tui] Add `multiselect` option to `SelectListWidget`
[Tui] Add the component
[Tui] Various fixes and hardenings
[Tui] Fix stdin framing and key id decoding
[Tui] Clamp borders that do not fit their container
[Tui] Fix invisible border with null color in BorderPattern's inverse strategies
Merge branch '8.1' into 8.2
Cleanups
Add call to backers in README files
[Tui] Fix stop() scrolling the top of the frame off the screen