This makes JitBaseBlockCache::ErasePhysicalRange around 50% faster and
PPCAnalyzer::Analyze around 40% faster. Rogue Squadron 2's notoriously
laggy action of switching to and from cockpit view is made something
like 20-30% faster by this, though this is a very rough measurement.

BreakpointsWidget: Add option to toggle all breaking

Allows you to quickly stop breaking, play the game, then re-enable breaking. useful if you have many active breakpoints, but need to run the game.

This will make the upcoming commits just a little bit neater to
implement.

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...)

c++23: Replace Common::Unreachable with std::unreachable