dep/libchdr: Fix handling of duplicate codecs

CI: Remove Flathub push

System: Fix no-disc startup in later versions

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