Yellow squiggly lines begone!
Done automatically on .cpp files through `run-clang-tidy`, with manual corrections to the mistakes.
If an import is directly used, but is technically unnecessary since it's recursively imported by something else, it is *not* removed.
The tool doesn't touch .h files, so I did some of them by hand while fixing errors due to old recursive imports.
Not everything is removed, but the cleanup should be substantial enough.
Because this done on Linux, code that isn't used on it is mostly untouched.
(Hopefully no open PR is depending on these imports...)

Special message on the Achievements window if the token is invalid/expired.

Added some new visibility toggles so players can choose what to show (or hide) during their RetroAchievements runs:

Toggle for the Speedrun Leaderboards timer

Toggle for Achievement Challenge badges

This reverts commit 826f04d06c89011fa7e47531111ee90b27344c8a.

Some refactoring done to hardcore toggling so that it's more readily available for the toggle hardcore event.

Achievements Confirmation Dialogs