Migrate from Qt-based stremio to Rust/CEF-based stremio-linux-shell.
Add stremioScaleFactor option (uses --force-device-scale-factor) for
4K TV display scaling. Set to 2.0 on boxy and gym-box.
Remove the custom plasma-bigscreen role and package, switching boxy and
gym-box to use the existing kodi role instead. The kodi role now
supports wayland and appLauncherServer with the same options.
johno