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...)
Essentially adds the funcitonality from PR #6091 to Unix
platforms. This allows third party tools like DME and JuniorsToolbox
to access the shared memory region allowing them to manipulate game
memory for various functionality. To do this, keep the shared memory
object mapped to a name so that the other process can access it,
instead of unlinking it from the name right after creation. This might
leak files into the filesystem, like mentioned in
https://github.com/dolphin-emu/dolphin/pull/9834#discussion_r803123299,
but will only be one virtual file per dolphin so I think it's fine.
