SmallString: MSVC warning fix

Qt: Work around theme switching bug

Qt: Purge some unused debug menu options

Build: Fix DiscordRPC not being included in Mac bundle

System: Ensure titles are sanitized for screenshots

CI: Re-enable Flathub pushes

The job can just take longer.. can't be arsed to write a separate
workflow at the moment.

Atualização Português do Brasil (stenzek#3218)

Atualizado para a última versão.

CI/Flatpak: Push to Flathub

CI/Flatpak: Disable SDK CFLAGS

It's setting _GLIBCXX_ASSERTIONS in release builds, which has a
performance hit.

FullscreenUI: Add "Open Containing Directory"